banks dretke director texas department criminal justice correctional institutions division argued december decided february police found corpse near texarkana texas deputy sheriff willie huff learned decedent seen petitioner banks three days earlier paid informant told deputy huff banks driving dallas fetch weapon deputy huff followed banks residence return trip police stopped banks vehicle found handgun arrested car occupants returning dallas residence deputy huff encountered charles cook recovered second gun cook said banks left residence several days earlier testing second gun proved murder weapon prior banks trial state advised defense counsel without necessity motions state provide banks discovery entitled nevertheless state withheld evidence allowed banks discredit two essential prosecution witnesses trial guilt phase cook testified inter alia banks admitted kill ing white boy cook thrice denied talking anyone testimony fact deputy huff prosecutors intensively coached cook testimony least one pretrial session prosecution allowed cook misstatements stand uncorrected banks capital murder conviction jury found banks probably commit criminal acts violence constitute continuing threat society one state two witnesses robert farr testified banks retrieved gun dallas order commit robberies according farr banks said take care trouble arose crimes two defense witnesses impeached farr turn impeached banks testified among things although traveled dallas obtain gun intent participate robberies farr alone planned commit summation prosecution suggested banks traveled dallas supply farr weapon stressing farr testimony banks said take care trouble arising robberies prosecution urged jury find farr credible farr admission used narcotics prosecution suggested indicated open honest every way state disclose farr paid informant told deputy huff dallas trip judge sentenced banks death banks direct appeal state continued hold secret farr cook links police postconviction motion banks alleged first time prosecution knowingly failed turn exculpatory evidence revealed farr police informant banks arrest banks also alleged trial guilt phase state deliberately withheld information deal prosecutors made cook critical jury assessment cook credibility banks asserted state actions violated brady maryland held prosecution suppression evidence requested favorable accused violates due process evidence material either guilt punishment irrespective prosecution good bad faith state denied banks allegations state postconviction rejected claims banks filed instant federal habeas petition alleging relevant state withheld material exculpatory evidence revealing farr police informant banks arrest banks alleged state concealed cook incentive testify manner favorable prosecution banks attached affidavits farr cook february motion seeking discovery evidentiary hearing farr declaration stated agreed help deputy huff murder investigation fear huff arrest drug charges huff paid farr set banks convincing drive dallas retrieve banks gun cook recalled participated practice sessions banks trial prosecutors told must either testify wanted spend rest life prison response magistrate judge disclosure order federal habeas proceeding prosecution gave banks transcript september pretrial interrogation cook police prosecutors transcript provided compelling evidence cook testimony tutored bear whether cook deal prosecution federal evidentiary hearing huff acknowledged first time farr informant paid involvement banks case banks trial prosecutor testified however deal offered gain cook testimony magistrate judge recommended writ habeas corpus respect banks death sentence based inter alia state failure disclose farr informant status judge recommend disturbing verdict concluding regard banks properly pleaded brady claim based september cook interrogation transcript district adopted magistrate judge report rejected banks argument cook transcript claim treated raised pleadings federal rule civil procedure fifth circuit reversed extent district granted relief banks farr brady claim appeals recognized prior federal habeas proceedings prosecution suppressed farr informant status part dallas trip fifth circuit nonetheless concluded banks act diligently develop facts underpinning farr brady claim pursued postconviction application lack diligence appeals held rendered evidence uncovered federal habeas proceeding procedurally barred event fifth circuit ruled farr status informant material brady purposes fifth circuit judgment banks impeached farr trial bringing unreliable police informant arkansas much farr testimony corroborated witnesses including banks acknowledged willingness get gun farr use robberies fifth circuit also denied certificate appealability banks cook brady claim accord district appeals rejected banks assertion cook brady claim aired implied consent rule required treated raised pleadings held fifth circuit erred dismissing banks farr brady claim denying certificate appealability cook brady claim police prosecutors conceal significant exculpatory impeaching material state possession ordinarily incumbent state set record straight pp banks brady claims arose regime place prior antiterrorism effective death penalty act aedpa banks farr brady claim trains death sentence barred three elements brady claim satisfied suppression farr informant status bearing reliability jury verdict regarding punishment banks also demonstrated cause prejudice precluded gaining federal habeas relief failure produce evidence anterior proceedings pp habeas law required banks exhaust available remedies order pursue relief see rose lundy banks satisfied requirement alleging habeas application prosecution knowingly failed turn exculpatory evidence farr banks however failed produce evidence state postconviction establishing farr served deputy sheriff huff informant federal habeas forum banks must show thereby barred producing evidence substantiate farr brady claim banks entitled evidentiary hearing show cause failure develop facts state actual prejudice resulting failure keeney brady prosecutorial misconduct claim three essential elements strickler greene beyond debate first element evidence issue favorable accused exculpatory impeaching satisfied farr paid informant status plainly qualifies evidence advantageous banks cause prejudice case parallel second third three brady components corresponding second brady element state suppressed evidence issue petitioner shows cause reason failure develop facts proceedings state suppression relevant evidence coincident third brady component prejudice ensued prejudice within compass cause prejudice requirement exists suppressed evidence material brady purposes ibid thus banks succeeds demonstrating cause prejudice also succeed establishing essential elements farr brady claim pp banks shown cause failing present evidence state capable substantiating farr brady claim strickler instructs second state asserted eve trial disclose brady material banks faulted relying representation see strickler banks appropriately assumed police engage improper litigation conduct obtain conviction none state arguments distinguishing strickler cause issue accounts adequately state concealment misrepresentation farr link huff light misrepresentations banks lack appropriate diligence pursuing farr brady claim state banks fault failing move postconviction proceedings investigative assistance inquire farr police connections state law entitled aid roviaro concerned government obligation reveal identity informant call witness support state position pp state suppression farr informant status material brady purposes materiality standard brady claims met favorable evidence reasonably taken put whole case different light undermine confidence verdict kyles state argument farr informant status rendered cumulative impeachment trial contradicted record neither witness called impeach farr gave evidence directly relevant farr part banks prosecution impeaching witnesses moreover impeached prosecution stressed summation prosecution turned advantage remaining impeachment evidence suggesting farr admission drug use demonstrated openness honesty pp lower courts wrongly denied banks certificate appealability regard brady claim resting prosecution suppression september cook interrogation transcript appeals rejected banks contention rule required claim treated raised pleadings transcript substantiating claim aired evidentiary hearing magistrate judge fifth circuit apparently relied debatable view rule inapplicable habeas proceedings twice assumed rule application proceedings harris nelson withrow williams withrow district granted habeas claim neither pleaded considered evidentiary hearing even argu ed parties held trial claim implied consent manifestly respondent warden prejudiced lack opportunity present evidence bearing claim resolution contrast issue undisclosed cook interrogation transcript aired hearing magistrate judge transcript admitted evidence without objection fifth circuit view evidentiary hearing aligned trial rule purposes well grounded agree appeals applying rule habeas proceedings undermine state exhaustion procedural default defenses ibid law inconsistency arose rule defenses doubtless cases assumed rule application habeas proceedings see ibid aedpa forbids finding exhaustion waived absent express waiver state law allowed waiver defenses exhaustion procedural default based state litigation conduct see gray netherland obtain certificate appealability prisoner must demonstrate reasonable jurists disagree district resolution constitutional claims issues presented warrant encouragement proceed cockrell case fits description application rule pp fed appx reversed remanded ginsburg delivered opinion rehnquist stevens kennedy souter breyer joined scalia thomas joined part iii thomas filed opinion concurring part dissenting part scalia joined delma banks petitioner doug dretke director texas department criminal justice correctional institutions division writ certiorari appeals fifth circuit february justice ginsburg delivered opinion petitioner delma banks convicted capital murder sentenced death prior trial state advised banks attorney need litigate discovery issues representing without necessity motions provide discovery entitled app app pet cert sources internal quotation marks omitted despite undertaking state withheld evidence allowed banks discredit two essential prosecution witnesses state disclose one witnesses paid police informant disclose pretrial transcript revealing witness trial testimony intensively coached prosecutors law enforcement officers furthermore prosecution raised red flag informant testified untruthfully never gave police statement indeed talked police officer case days trial instead correcting informant false statements prosecutor told jury witness ha open honest every way app testimony utmost significance similarly prosecution allowed key witness convey untruthfully testimony entirely unrehearsed direct appeal state collateral review proceedings state continued hold secret key witnesses links police allowed false statements stand uncorrected ultimately discovery evidentiary hearing authorized federal habeas corpus proceeding evidence came light district granted banks relief death penalty appeals reversed latter judgment banks documented claims prosecutorial misconduct late wrong forum therefore qualify relief reverse judgment police prosecutors conceal significant exculpatory impeaching material state possession ordinarily incumbent state set record straight april police found corpse richard whitehead pocket park east nash texas town vicinity texarkana preliminary autopsy revealed whitehead shot three times bowie county deputy sheriff willie huff lead investigator death learned two witnesses whitehead company petitioner delma banks late evening april banks state tex crim app en banc cert denied april huff received call confidential informant reporting banks coming dallas meet individual get weapon app evening huff officers followed banks south dallas banks visited residence ibid brief petitioner police stopped banks vehicle en route dallas found handgun car arrested car occupants app returning dallas residence banks visited huff encountered interviewed charles cook recovered second gun weapon cook said banks left several days earlier ibid tests later identified second gun whitehead murder weapon may pretrial hearing banks counsel sought information huff concerning confidential informant told huff banks driving dallas huff unresponsive ibid information might reveal identity informant prosecution urged privileged trial sustained state objection several weeks later july letter prosecution advised banks counsel state without necessity motions provide discovery entitled app pet cert sources internal quotation marks omitted guilt phase banks trial spanned two days september see brief petitioner app pet cert witnesses testified seeing banks whitehead together april whitehead green mustang hearing gunshots pocket park april banks state charles cook testified banks arrived dallas green mustang april stayed cook april app cook gave following account banks visit morning arrival banks blood leg told cook got highway white boy night banks confessed kill ed white boy hell take car come dallas ensuing conversation cook first noticed banks pistol two days later banks left dallas bus next day cook abandoned mustang west dallas sold banks gun neighbor cook testified shortly police arrived residence question banks revisited requested gun cook three times represented talked anyone testimony fact however cook least one pretrial practice sessio huff prosecutors intensively coached cook appearance stand banks trial joint lodging material transcript pretrial preparatory session prosecution allowed cook misstatements stand uncorrected summation prosecution told jury cook brought absolute truth app addition cook robert farr key witness prosecution corroborating parts cook account farr testified traveling dallas banks retrieve banks gun defense counsel asked farr whether ever taken money police officers give police officers statement farr answered questions asserted emphatically police officers promised anything talked one case days trial ibid answers untrue state correct farr paid informant told deputy sheriff huff banks travel dallas search gun app pet cert affidavit farr explained assumed help huff investigation delma arrested drug charges agreed help huff afraid help arrested willie huff asked help find delma gun told huff pay money right away help case think altogether gave helping paid money set delma paid rest delma arrested charged murder order help willie huff set delma told delma wanted rob pharmacy get drugs needed gun really plan commit robbery told delma give gun convinced delma drive dallas get gun app defense presented evidence app pet cert banks convicted murder committed course robbery violation tex penal code ann see app pet cert penalty phase ran course next day ibid governed texas statutory capital murder scheme applicable jury decided banks sentence answering three special issues app jury unanimously answer ed issue submitted trial obliged sentence defendant death penry lynaugh construing texas sentencing scheme tex code crim proc arts vernon supp critical question penalty phase banks case find evidence beyond reasonable doubt probability defendant delma banks commit criminal acts violence constitute continuing threat society app internal quotation marks omitted question state offered two witnesses vetrano jefferson robert farr jefferson testified early april banks struck across face gun threatened kill farr testimony focused trip dallas fetch banks gun gun needed farr asserted farr banks going pull robberies according farr banks said take care trouble burglaries prosecution asked banks say take care farr responded banks go specifics said taken care ibid defense counsel twice asked whether farr told deputy sheriff huff dallas trip ibid state remained silent farr twice perjuriously testified ibid banks counsel also inquired whether farr previously attempted obtain prescription drugs fraud tight testify anything anybody want ed hear farr first responded prove ibid instructed answer defense counsel questions farr said ibid two defense witnesses impeached farr turn impeached james kelley testified farr attempts obtain drugs fraud prosecution impeached kelley eliciting close relationship banks girlfriend later kelley admitted drunk stand app pet cert former arkansas police officer gary owen testified farr police informant arkansas given false information prosecution impeached owen bringing pending application employment defense counsel private investigator app banks parents acquaintances testified banks respectful churchgoing young man app pet cert app thereafter banks took stand affirmed ad never convicted felony banks admitted striking vetrano jefferson april traveling dallas obtain gun late april denied however intent participate robberies asserting farr alone planned commit prosecution suggested banks willing supply farr means possible death weapon armed robbery case banks conceded much ibid summation prosecution intimated banks wholly truthful regard suggesting man travel two hundred miles whatever distance texarkana dallas texas supply person weapon state homed farr testimony banks said take care trouble arising robbery farr said know trouble banks says worry take care think speaks think know means submit beyond reasonable doubt state met burden proof answer question number two propensity commit violent criminal acts also yes see also urging farr credibility prosecution called jury attention farr admission trial used narcotics farr truthful drug use prosecution suggested also open honest jury every way testimony farr testimony prosecution emphasized utmost significance showed banks danger friends strangers alike banks effort impeach farr ineffective prosecution urged defense witness kelley kn ew nothing murder defense witness owen wish ed please future employers jury answered yes three special issues judge sentenced banks death texas criminal appeals denied banks direct appeal banks first two state postconviction motions raised issues implicated denied ex parte banks tex crim app ex parte banks tex crim app banks third state postconviction motion filed january presented questions later advanced federal reiterated petition us app banks alleged upon information belief prosecution knowingly failed turn exculpatory evidence required brady maryland withheld evidence banks asserted revealed robert farr police informant banks arrest app internal quotation marks omitted support third postconviction plea banks attached unsigned affidavit girlfriend farr demetra jefferson stated farr law enforcement people consequently managed stay trouble illegally obtaining prescription drugs banks alleged well guilt phase trial state deliberately withheld information critical jury assessment cook credibility including generous cook cut prosecutors state reply banks pleading filed october denie every allegation fact made banks except supported official records specifically admitted tr oral arg othing kept secret defense state represented app reply specifically asserted state made deal cook state said nothing specific farr affidavits deputy sheriff huff prosecutors accompanied reply affiants denied deal secret otherwise charles cook like state pleading supported remained silent farr ibid february july orders state postconviction rejected banks claims app pet cert found agreement state witness charles cook made findings concerning farr january per curiam order texas criminal appeals upheld lower disposition banks motion march banks filed instant petition writ habeas corpus district eastern district texas app alleged multiple violations federal constitutional rights app pet cert relevant banks reasserted state withheld material exculpatory evidence reveal ing robert farr police informant banks arrest app internal quotation marks omitted banks also asserted state concealed cook enormous incentive testify manner favorable prosecution app pet cert june banks moved discovery evidentiary hearing gain information state roles played trial testimony provided farr cook app superintending magistrate judge allowed limited discovery regarding cook found insufficient justification inquiries concerning farr banks renewed discovery evidentiary hearing requests february time proffered affidavits farr cook back claims two key witnesses prosecution wrongly withheld crucial exculpatory impeaching evidence farr affidavit affirmed farr set delma proposing drive dallas informing deputy sheriff huff trip supra accounting unavailability earlier farr stated less year banks trial left texarkana first oklahoma california work endangered life app pet cert cook recalled preparation banks trial testimony participated three four practice sessions prosecutors told testify wanted spend rest life prison app march magistrate judge issued order establishing issues evidentiary hearing consider banks claims state withheld crucial exculpatory impeaching evidence concerning two tate essential witnesses charles cook robert farr internal quotation marks omitted anticipation hearing magistrate judge ordered disclosure bowie county district attorney files brief petitioner tr june federal evidentiary hearing ed tex hereinafter federal evidentiary hearing one item lodged district attorney files turned banks pursuant magistrate judge disclosure order transcript cook interrogation app pet cert interrogation conducted bowie county law enforcement officials prosecutors occurred september shortly banks trial ibid transcript revealed state representatives closely rehearsed cook testimony particular officials told cook reconcile testimony affidavits earlier subscribed recounting banks visits dallas see joint lodging material april statement obviously screwed way statement read et tell going work earlier although transcript bear banks claim prosecution deal cook provided compelling evidence cook testimony tutored banks prosecutors without objection hearing magistrate judge admitted september transcript evidence brief petitioner federal evidentiary hearing testifying evidentiary hearing deputy sheriff huff acknowledged first time farr informant paid involvement case app pet cert cook banks trial prosecutor testified line state consistent position deal offered gain cook trial testimony federal evidentiary hearing defense counsel questioned prosecutor september transcript calling attention discrepancies transcript cook statements trial posthearing brief proposed findings fact conclusions law banks emphasized suppression september transcript noting prosecution obligation disclose material exculpatory evidence assurance case banks receive discovery banks entitled app internal quotation marks omitted supra may report recommendation magistrate judge recommended writ habeas corpus respect banks death sentence conviction app pet cert state failure disclose farr informant status coupled trial counsel dismal performance punishment phase magistrate judge concluded undermined reliability jury verdict regarding punishment finding convincing evidence deal state cook however recommended verdict remain undisturbed banks moved alter amend magistrate judge report ground left unresolved fully aired question whether banks rights violated state failure disclose defense prosecution interrogation cook app interrogation banks observed reconciled cook insistence trial talked one testimony see supra district adopted magistrate judge report denied banks motion amend report app pet cert app concerning cook brady claim district recognized banks filed federal petition three years became aware september transcript app transcript surfaced response magistrate judge disclosure order banks raised newly discovered long withheld document proposed findings fact conclusions law objections magistrate judge report district concluded however banks properly pleaded brady claim predicated withheld cook rehearsal transcript app brady claim came light district reasoned banks moved amend supplement federal habeas petition specifically include discovery basis relief app banks urged brady claim based september transcript aired implied consent federal rule civil procedure contended claim treated raised pleadings app banks sought district denied certificate appealability question august unpublished per curiam opinion appeals fifth circuit reversed judgment district extent granted relief farr brady claim denied certificate appealability cook brady claim app pet cert judgt order reported fed appx appeals observed postconviction application banks endeavored develop facts underpinning farr brady claim app pet cert reason held evidentiary proceeding ordered magistrate judge unwarranted ibid appeals expressed doubt prosecution suppressed prior federal habeas proceeding farr informant status part fateful trip dallas banks appropriately diligent pursuing application appeals maintained fifth circuit view banks time attempted locate farr question similarly asked interview deputy sheriff huff officers involved investigating crime efforts proved unavailing appeals suggested banks might applied state assistance banks lack diligence pursuing plea appeals concluded rendered evidence uncovered federal habeas proceeding procedurally barred event fifth circuit concluded farr status informant materia brady purposes app pet cert banks impeached farr trial bringing police informant arkansas unreliable one supra moreover appeals said witnesses corroborated much farr testimony banks app pet cert notably banks acknowledged willingness get gun farr use robberies ibid addition fifth circuit observed magistrate judge relied cumulative effect brady error ineffectiveness banks counsel penalty phase app pet cert banks however urged position argued brady ineffective assistance counsel discretely cumulatively app pet cert finally accord district appeals apparently regarded rule inapplicable habeas proceedings app pet cert fifth circuit accordingly denied certificate appealability cook brady claim app pet cert execution date set march banks applied writ certiorari presenting four issues tenability farr brady claim claim question whether cook brady claim certificate appealability wrongly denied claim improper exclusion minority jurors violation swain alabama pet cert stayed banks execution march april granted petition questions swain claim reverse appeals judgment dismissing banks farr brady claim denial certificate appealability cook brady ii note initially bank brady claims arose regime place prior antiterrorism effective death penalty act aedpa stat turning tenability claims consider first banks farr brady claim trains death sentence see app pet cert district granted habeas solely respect capital sentence next banks cook brady claim pursue habeas corpus relief federal banks first exhaust remedies available courts state ed see rose lundy banks alleged january application writ habeas corpus prosecution knowingly failed turn exculpatory evidence involving farr violation banks due process rights app banks thus satisfied exhaustion requirement legal ground farr brady state postconviction however banks failed produce evidence establishing farr served police informant case support farr brady claim banks appended application demetra jefferson hardly probative statement farr law enforcement people app see supra federal habeas forum therefore incumbent banks show barred reason anterior state proceedings producing evidence substantiate farr brady claim banks entitled evidentiary hearing federal show cause failure develop facts proceedings actual prejudice resulting failure keeney brady reiterate held suppression prosecution evidence favorable accused upon request violates due process evidence material either guilt punishment irrespective good faith bad faith prosecution three components essential elements brady prosecutorial misconduct claim evidence issue must favorable accused either exculpatory impeaching evidence must suppressed state either willfully inadvertently prejudice must ensued ause prejudice case parallel two three components alleged brady violation corresponding second brady component evidence suppressed state petitioner shows cause reason failure develop facts proceedings state suppression relevant evidence coincident third brady component prejudice prejudice within compass cause prejudice requirement exists suppressed evidence material brady purposes first brady component evidence favorable accused beyond genuine debate suppressed evidence relevant farr paid informant status qualifies evidence advantageous banks see app pet cert appeals recognition farr paid informant certainly favorable banks attacking farr testimony thus banks succeeds demonstrating cause prejudice time succeed establishing elements farr brady death penalty due process claim determination cause banks failure develop facts proceedings informed case virginia prosecutors told petitioner prior trial prosecutor files open petitioner counsel thus need formal brady motion quoting app strickler greene pp brackets original prosecution file given strickler petitioner however include several documents prepared importan prosecution witness recounting witness initial difficulty recalling events testified petitioner trial documents used impeach witness postconviction proceedings strickler petitioner unsuccessfully urged ineffective assistance trial counsel based counsel failure move pretrial brady material answering plea state asserted brady motion superfluous prosecution maintained open file policy pursuant disclosed brady material determined federal habeas proceedings strickler petitioner shown cause failure raise brady claim state three factors accounted determination prosecution withheld exculpatory evidence petitioner reasonably relied prosecution open file policy fulfilling prosecution duty disclose evidence state confirmed petitioner reliance open file policy asserting state habeas proceedings petitioner already received everything known government ibid internal quotation marks omitted case congruent strickler three respects first state knew kept back farr arrangement deputy sheriff huff app pet cert tr oral arg cf kyles whitley prosecutors responsible favorable evidence known others acting government behalf case including police second state asserted eve trial disclose brady material app see supra strickler instructs banks faulted relying representation see open file policy one factor explain trial counsel advance brady claim third january state habeas application banks asserted farr police informant banks arrest app internal quotation marks omitted answer state denied banks assertion see supra state thereby confirmed banks reliance prosecution representation fully disclosed relevant information file contained see state habeas counsel well trial counsel reasonably rely state representations short state persisted hiding farr informant status misleadingly represented complied full brady disclosure obligations banks cause failing investigate state postconviction proceedings farr connections deputy sheriff huff question cause moreover banks case stronger petitioner strickler notable respect prosecution witness guilt penalty phases banks trial farr repeatedly misrepresented dealings police time farr responded untruthfully prosecution allowed testimony stand uncorrected see supra farr denied taking money promised anything police officers app twice denied speaking police officers twice denied informing deputy sheriff huff banks trip dallas long established prosecution deliberate deception jurors presentation known false evidence incompatible rudimentary demands justice giglio quoting mooney holohan per curiam reasonable banks rely prosecution full disclosure representation also appropriate banks assume prosecutors stoop improper litigation conduct advance prospects gaining conviction see berger strickler state presents three main arguments distinguishing strickler issue cause two endorsed appeals brief respondent app pet cert see supra conclude none arguments accounts adequately state concealment misrepresentation regarding farr link deputy sheriff huff state first suggests banks failure state postconviction proceedings attempt locate farr ascertain true status interview investigating officers deputy huff ascertain farr status undermines finding cause fifth circuit agreed app pet cert brief respondent state view question cause revolves around banks conduct particularly lack appropriate diligence pursuing farr brady claim resorting federal brief respondent rejected similar argument strickler state contended examination witness trial testimony alongside letter witness published local newspaper alerted petitioner existence undisclosed interviews witness police quoting murray carrier state nevertheless urges effect prosecution lie conceal prisoner still burden discover evidence tr oral arg long potential existence prosecutorial misconduct claim might detected rule thus declaring prosecutor may hide defendant must seek tenable system constitutionally bound accord defendants due process ordinarily presume public officials properly discharged official duties bracy gramley quoting chemical foundation several times underscored special role played american prosecutor search truth criminal trials strickler berger brandeis dissenting courts litigants juries properly anticipate obligations refrain improper methods secure conviction plainly rest ing upon prosecuting attorney faithfully observed berger prosecutors dishonest conduct unwarranted concealment attract judicial approbation see kyles prudence careful prosecutor state second argument variant first specifically state argues appeals accepted banks show cause postconviction proceedings failed move investigative assistance enabling inquire farr police connections connections alleged failed prove brief respondent app pet cert see tex laws ch amended instructing postconviction designat issues fact resolved giving discretion order affidavits depositions interrogatories hearings armed demetra jefferson declaration farr law enforcement people app see supra banks little proffer support request assistance state postconviction assign overriding significance banks failure invoke assistance clear entitlement cf strickler proper respect state procedures counsels requirement possible claims raised state collateral proceedings even known facts support finally relying roviaro state asserts disclosure informant identity automatic onsequently banks duty move disclosure otherwise privileged information brief respondent need linger argument issue evidentiary law roviaro whether government obliged reveal identity undercover informer government call trial witness stated privilege obtains disclosure informer identify contents communication relevant helpful defense accused accordingly even though informer roviaro testify held disclosure identity necessary amplif ied contradict ed testimony government witnesses state elected call farr witness indeed key witness guilt punishment phases banks capital trial farr status paid informant unquestionably relevant similarly beyond doubt disclosure farr status helpful banks defense nothing roviaro decision suggests state examine informant trial withholding acknowledgment informant status hope defendant catch make disclosure motion summary banks prosecutors represented trial state postconviction proceedings state held nothing back moreover state postconviction state pleading denied farr informant app supra incumbent banks prove representations false rather banks entitled treat prosecutor submissions truthful accordingly banks shown cause failing present evidence state capable substantiating farr brady claim unless suppressed evidence material brady purposes suppression give rise sufficient prejudice overcome procedural default strickler kyles instructed materiality standard brady claims met favorable evidence reasonably taken put whole case different light undermine confidence verdict see also defendant need demonstrate discounting inculpatory evidence light undisclosed evidence enough left convict accord strickler short banks must show reasonable probability different result kyles internal quotation marks omitted citing bagley state acknowledged oral argument farr paid critical role scenario led indictment tr oral arg farr declaration presented federal habeas asserts farr banks initiated proposal obtain gun facilitate commission robberies see app supra farr instigated upon deputy sheriff huff request dallas excursion fetch banks gun prosecution slim evidence banks planned continue committing violent acts app farr admission instigating role moreover dampened prosecution zeal urging jury bear mind banks planning acquisition gun commit robbery banks planned violence ibid see tr oral arg banks criminal record farr testimony banks propensity commit violent acts crucial prosecution without testimony state underscored three times penalty phase banks use gun fetched dallas take care trouble arising robberies app see supra stress placed prosecution part farr testimony uncorroborated witness belies state suggestion farr testimony adequately corroborated brief respondent prosecution summation moreover left doubt importance state attached farr testimony farr told jury prosecution urged utmost significance show banks danger friends strangers alike app strickler although found cause petitioner procedural default brady claim found requisite prejudice absent regarding prejudice contrast strickler banks case marked witness whose impeachment issue strickler gave testimony main cumulative hardly significant one two predicates capital murder armed robbery evidence record found provided strong support conviction even witness testimony excluded entirely unlike banks prosecution strickler considerable forensic physical evidence link ed defendant crime supported capital murder conviction tellingly witness testimony strickler relate petitioner eligibility death sentence relied upon prosecution closing argument penalty phase contrast farr testimony centerpiece banks prosecution case farr trial testimony critical penalty phase cast large doubt declaration banks ultimately obtained farr introduced federal habeas proceeding see supra guilt phase banks trial farr acknowledged narcotics use app penalty phase banks counsel asked farr drawn tight previous activity testify anything anybody want ed hear farr denied supra farr declaration supporting banks federal habeas petition however vividly contradicts denial assumed help huff arrested drug charges app jurors known farr continuing interest obtaining deputy sheriff huff favor addition receipt funds set banks might well distrusted farr testimony insofar uncorroborated disregarded jury moreover benefit customary precautions generally accompany testimony informants long recognized serious questions credibility informers pose lee see also trott words warning prosecutors using criminals witnesses hastings jurors suspect informants motives moment hear case frequently disregard testimony altogether highly untrustworthy unreliable therefore allowed defendants broad latitude probe informants credibility counseled submission credibility issue jury careful instructions lee see also grenig lee federal jury practice instructions criminal ed jury instructions first fifth sixth seventh eighth ninth eleventh circuits special caution appropriate assessing informant testimony state argues farr heavily impeached trial rendering informant status merely cumulative tr oral arg see brief respondent post record suggests otherwise neither witness called impeach farr gave evidence directly relevant farr part banks trial app prosecutor noted kelley lacked personal knowledge regard case trial impeaching witnesses kelley owen moreover impeached prosecution stressed summation see supra prosecution turned advantage remaining impeachment evidence concerning farr drug use summation prosecution suggested farr admission used dope shot demonstrated farr open honest jury every way app supra least penalty phase sum one hardly confident banks received fair trial given jury ignorance farr true role investigation trial case see kyles question whether defendant likely received different verdict evidence whether absence received fair trial understood trial resulting verdict worthy record us one plausibly deny existence requisite reasonable probability different result suppressed information disclosed defense ibid internal quotation marks omitted citing bagley strickler accordingly suppression farr informant status bearing reliability jury verdict regarding punishment app pet cert supra three elements brady claim satisfied iii district appeals denied banks certificate appealability regard cook brady claim rested prosecution suppression september cook interrogation transcript app app pet cert supra see also joint lodging material district fifth circuit concluded banks properly pleaded claim sought leave amend petition stated claim submissions proposed findings fact conclusions law objections magistrate judge report app app pet cert supra banks contended unsuccessfully evidence substantiating cook brady claim aired magistrate judge therefore claim treated raised pleadings federal rule civil procedure instructs see app pet cert supra setting text rule fifth circuit stated position point somewhat obliquely appears viewed rule inapplicable habeas proceedings state concedes however question whether rule extends habeas proceedings one jurists reason find debatable compare app pet cert quoting slack mcdaniel tr oral arg conclude certificate appealability issued twice referenced rule application federal habeas proceedings harris nelson noted rule use habeas proceedings noncontroversial withrow williams similarly assumed rule application habeas petitions however district granted writ habeas corpus claim neither pleaded considered evidentiary hearing even argu ed parties given circumstances held trial claim implied consent respondent warden observed manifestly prejudiced district failure afford opportunity present evidence bearing th claim resolution contrast issue undisclosed cook interrogation transcript indeed aired magistrate judge transcript admitted evidence without objection see supra appeals found authority equating evidentiary hearing trial rule purposes app pet cert see reason evidentiary hearing qualify long respondent gave sort consent full fair opportunity present evidence bearing th claim resolution withrow failure raise procedural default federal habeas means defense lost granberry greer full trial held district evident miscarriage justice occurred may appropriate appeals hold nonexhaustion defense waived obtain certificate appealability prisoner must demonstrat jurists reason disagree district resolution constitutional claims jurists conclude issues presented adequate deserve encouragement proceed cockrell least application rule case surely fits description certificate appealability therefore issued reasons stated judgment appeals fifth circuit reversed case remanded proceedings consistent opinion ordered delma banks petitioner doug dretke director texas department criminal justice correctional institutions division writ certiorari appeals fifth circuit february justice thomas justice scalia joins concurring part dissenting part join part iii opinion respectfully dissent part ii holds banks claim brady maryland relating nondisclosure evidence farr accepted money police officer course investigation warrants habeas relief although find close question conclude nondisclosure farr informant status prejudicial kyles whitley demonstrate prejudice banks must show favorable evidence reasonably taken put whole case different light undermine confidence verdict kyles supra undisclosed material consisted evidence willie huff asked farr help find banks gun huff gave farr helping app farr declaration banks contends farr receipt huff revealed defense reasonable probability kyles supra jury found beyond reasonable doubt probability defendant delma banks commit criminal acts violence constitute continuing threat society app second special issue presented jury internal quotation marks omitted believe reasonable probability jury altered finding jury presented facts horrible crime banks meeting victim richard whitehead boy misfortune owning car banks wanted decided kill person hell take car banks state tex crim app en banc cert denied banks proceeded shoot whitehead three times twice head upper back banks fired one shots inches away whitehead jury thus presented evidence showing banks apparently whim executed whitehead simply get car jury also presented evidence form banks testimony willing abet another individual obtaining gun full knowledge gun aid future armed robberies colloquy prosecuting attorney banks makes clear banks thought going supply farr gun armed robberies supply gun gun words care whose going man got gun armed robberies correct going understand going supply means possible death weapon armed robbery case correct yes app banks accordingly jury also presented banks willingness assist others committing deadly crimes indeed prosecution referenced fact one point closing argument attempt convince jury banks posed threat commit violent acts future testimony vetrano jefferson robert farr utmost significance vetrano brought scar face put delma banks also corroborates supports testimony robert farr believe robert order find delma went dallas get pistol somebody robberies marcus jefferson told emphasis added jury also heard testimony banks violently threatened kill one week murder banks claims evidence discounted trial counsel failed uncover responsible fight brief petitioner even appropriate prejudice analysis brady claim claim strickland washington rather evaluate independently distinct potential constitutional violations banks response vastly disproportional actions sum jury knew banks murdered whim violently attacked threatened relative shortly murder willing assist another individual committing armed robberies providing means possible death weapon robberies app even jury discredit entirely farr testimony banks planning likelihood jury still found beyond reasonable doubt probability banks commit criminal acts violence constitute continuing threat society randomness wantonness murder perhaps standing alone mandate finding accordingly find nondisclosure evidence prejudicial banks show prejudice resolve whether cause excuse failure present farr brady evidence state keeney reasons doubt conclusion banks show cause instance concludes case congruent strickler greene ante relying part state general denial banks factual allegations contained january state habeas application relevant state postconviction proceeding strickler state alleged petitioner already received known government statement federal habeas proceedings established clearly true app emphasis added state denying prosecution knowingly failed turn evidence incidentally little evidence record tending show prosecutor actual knowledge huff payment farr state denying failed turn evidence violation brady evidence prosecution turn material position advanced state throughout federal habeas process see strickler supra trictly speaking never real violation unless nondisclosure serious reasonable probability suppressed evidence produced different verdict either way strickler clearly control reliance less compelling disposition banks farr brady claim address claim ineffective assistance counsel concluding relief obtain claim cumulative ante affirm appeals farr brady claim briefly discuss claim although find farr brady claim close call find claim banks comes nowhere close satisfying prejudice prong strickland washington supra conclusory uncorroborated claims level physical abuse allegations bad skin condition negatively affected childhood development evidence slow learner possessed willingness please others claim banks responsible receipt death threat unpersuasive reasonable probability jury come opposite conclusion respect future dangerousness special issue even presented evidence therefore conclude appeals err denied relief banks based farr brady claim strickland claim reverse appeals insofar grant certificate appealability cook brady claim footnotes although police officer testified whitehead body found april app texas criminal appeals stated body discovered april banks state en banc person commits offense commits murder person intentionally commits murder course committing attempting commit kidnapping burglary robbery aggravated rape arson tex penal code ann set forth texas law three special issues whether conduct defendant caused death deceased committed deliberately reasonable expectation death deceased another result whether probability defendant commit criminal acts violence constitute continuing threat society raised evidence whether conduct defendant killing deceased unreasonable response provocation deceased tex code crim proc arts vernon supp banks fact criminal record app app pet cert also history violence alcohol abuse seemed possess suggest particular risk future violence ibid brady maryland held suppression prosecution evidence favorable accused upon request violates due process evidence material either guilt punishment irrespective good faith bad faith prosecution banks also alleged ineffective assistance counsel guilt penalty phases insufficient evidence second special issue banks propensity commit violent criminal acts exclusion minority jurors violation swain alabama app pet cert banks filed two state postconviction motions denied brief respondent nn citing ex parte banks tex crim app per curiam ex parte banks tex crim app cert denied hereinafter refer claims farr brady cook brady claims respectively see supra federal rule civil procedure provides issues raised pleadings tried express implied consent parties shall treated respects raised pleadings amendment pleadings may necessary cause conform evidence raise issues may made upon motion party time rule rules governing section cases district courts provides federal rules civil procedure apply extent inconsistent habeas rules fifth circuit noted correctly lindh murphy standards antiterrorism effective death penalty act aedpa stat apply banks petition see app pet cert disposition farr brady claim conclusion writ habeas corpus issue respect death sentence render unnecessary address banks claim ineffective assistance counsel penalty phase relief obtain claim cumulative banks federal habeas petition appeals said stated claim brady material exculpatory impeachment evidence suppressed claim napue illinois giglio prosecution failed correct farr false testimony app pet cert app view appeals explained brady claim distinct giglio claim app pet cert thus two fit one umbrella cf bagley agurs brief parties debate issue brief petitioner brief respondent conclude banks qualifies relief brady need decide whether giglio claim warrant adjudication must separately pleaded surprisingly appeals per curiam opinion refer strickler greene controlling precedent issue cause app pet cert left open question whether one two factors sufficient constitute cause strickler need decide question today addition banks expected disclosure farr informant status matter state law farr fact acted capacity texas law applicable time banks trial state obligation disclose identity informant informant present time offense arrest otherwise shown material witness transaction kemner state tex crim app quoting carmouche state tex crim app cf tex rule evid privilege exists identity informer informer appears witness public farr present banks arrested app prosecution noted summation farr testimony material utmost significance appeals also stated state respond banks contention answer january state habeas application banks investigate app pet cert fifth circuit error regard apparent earlier recounted see supra state answer indeed deny banks allegation furthermore rather conceding need factual development farr brady claim state postconviction state asserted banks prosecutorial misconduct claims meritless procedurally barred tribunal app taken position state hardly fault banks failing earlier request assistance state certainly opposed bears reiteration banks criminal record app history violence alcohol abuse nothing indicative particular risk future violence app pet cert also appears remaining prosecution witness penalty phase vetrano jefferson omitted crucial details testimony september testimony vetrano jefferson said banks struck pistol early april app supra federal habeas proceeding vetrano jefferson elaborated banks initiated incident making disrespectful comments demetra jefferson banks girlfriend app vetrano jefferson recounted grew angry banks objected comments fight ensue course banks struck vetrano jefferson ibid brief oral argument state suggests damaging evidence banks willing abetment farr commission violent crime banks intent commit act brief respondent emphasis original tr oral arg see also post thomas concurring part dissenting part summation however prosecution highlighted banks propensity commit violent criminal acts see app facilitation others criminal acts see banks says thought give gun robberies believe jury believe man travel two hundred miles supply another person weapon special issue prosecution addressed focused acts banks commit harms might facilitate find evidence beyond reasonable doubt probability defendant delma banks commit criminal acts violence constitute continuing threat society ibid internal quotation marks omitted emphasis added therefore unsurprising prosecution rest banks facilitation others criminal acts urging jury answer second special issue propensity commit violent criminal acts affirmative see federal evidentiary hearing examining one banks prosecutors counsel banks twice asked cook instructed testify see also texarkana law enforcement instruct cook testify case testimony today show cook coached banks counsel called attention discrepancies portions september transcript cook trial testimony concluding examination banks counsel emphasized prosecution duty disclose september transcript cook stand stated coached app supra banks case provides occasion consider rule application aedpa regime footnotes address possible application standard enunciated giglio since agree appeals issue properly raised since addressing issue go beyond question certiorari granted see brief petitioner stating question presented whether fifth circuit commit ted legal error rejecting banks brady claim prosecution suppressed material witness impeachment evidence prejudiced penalty phase trial grounds suppressed evidence immaterial banks death sentence admittedly prosecution used closing argument trying convince jury believe farr testimony banks planning robberies see ante fact one reasons find materiality question close one quite possible jury already discredited aspect farr testimony jury knew testimony witnesses james kelley officer gary owen farr generally dishonest heard lied getting altercation doctor false prescriptions lied status informant arkansas officer cases suggests witnesses providing information impeached ante best though slightly impeached prosecution merely intimated owen slanting testimony hopes hired defense counsel private investigator app kelley friend banks family