hudson michigan argued january decided june detroit police executing search warrant narcotics weapons entered petitioner hudson home violation fourth amendment rule trial granted hudson motion suppress evidence seized michigan appeals reversed interlocutory appeal hudson convicted drug possession affirming state appeals rejected hudson renewed fourth amendment claim held judgment affirmed affirmed justice scalia delivered opinion respect parts ii iii concluding violation rule require suppression evidence found search pp michigan conceded entry violation issue whether exclusionary rule appropriate violation pp rejected ndiscriminate application exclusionary rule leon holding applicable deterrence benefits outweigh social costs pennsylvania bd probation parole scott exclusion may premised mere fact constitutional violation cause obtaining evidence illegal entry cause even causation attenuated justify exclusion attenuation occur causal connection remote also suppression serve interest protected constitutional guarantee violated interests protected rule include human life limb unannounced entry may provoke violence surprised resident property citizens presumably open door upon announcement whereas forcible entry may destroy privacy dignity sort offended sudden entrance rule never protected one interest preventing government seeing taking evidence described warrant since interests violated nothing seizure evidence exclusionary rule inapplicable pp social costs weighed deterrence considerable addition grave adverse consequence excluding relevant incriminating evidence always entails risk releasing dangerous criminals imposing massive remedy generate constant flood alleged failures observe rule claims asserted justification entry inadequate support another consequence police officers refraining timely entry knocking announcing producing preventable violence officers cases destruction evidence others next social costs deterrence benefits value deterrence depends strength incentive commit forbidden act incentive minimal ignoring realistically expected achieve nothing prevention evidence destruction avoidance resistance dangers suspend requirement reasonable suspicion exist richards wisconsin massive deterrence hardly necessary contrary hudson argument without suppression deterrence many forms police misconduct deterred suits consequences increasing professionalism police forces including new emphasis internal police discipline pp justice scalia joined chief justice justice thomas justice alito concluded part iv segura new york harris ramirez confirm conclusion suppression unwarranted case pp scalia delivered opinion respect parts ii iii roberts kennedy thomas alito joined opinion respect part iv roberts thomas alito joined kennedy filed opinion concurring part concurring judgment breyer filed dissenting opinion stevens souter ginsburg joined booker hudson petitioner michigan writ certiorari appeals michigan june justice scalia delivered opinion except part iv decide whether violation rule requires suppression evidence found search police obtained warrant authorizing search drugs firearms home petitioner booker hudson discovered large quantities drugs found including cocaine rocks hudson pocket loaded gun lodged cushion armrest chair sitting hudson charged michigan law unlawful drug firearm possession case us method entry house police arrived execute warrant announced presence waited short time perhaps three five seconds app turning knob unlocked front door entering hudson home hudson moved suppress inculpatory evidence arguing premature entry violated fourth amendment rights michigan trial granted motion interlocutory review michigan appeals reversed relying michigan cases holding suppression inappropriate entry made pursuant warrant without proper announce app pet cert citing people vasquez per curiam people stevens michigan denied leave appeal hudson convicted drug possession renewed fourth amendment claim appeal appeals rejected affirmed conviction app pet cert michigan declined review granted certiorari ii principle law enforcement officers must announce presence provide residents opportunity open door ancient one see wilson arkansas since congress passed espionage act traditional protection part federal statutory law see stat currently codified applied statute miller sabbath finally wilson asked whether rule also command fourth amendment tracing origins english legal heritage concluded recognized new constitutional rule announced easily applied wilson cases following noted many situations necessary knock announce necessary circumstances presen threat physical violence reason believe evidence likely destroyed advance notice given knocking announcing futile richards wisconsin require police reasonable suspicion particular circumstances one grounds failing knock announce exists acknowledged showing high ibid rule apply easy determine precisely officers must many seconds wait reasonable wait time standard see banks necessarily vague banks drug case like one held proper measure long take resident reach door long take dispose suspected drugs time seconds case necessarily extended instance suspected contraband easily concealed ex post evaluation subject calculations unsurprising ex ante police officers encounter someone may try harm uncertain long wait happily issues confront us trial level onward michigan conceded entry violation issue remedy wilson specifically declined decide whether exclusionary rule appropriate violation requirement question squarely us iii weeks adopted federal exclusionary rule evidence unlawfully seized home without warrant violation fourth amendment began applying rule fourteenth amendment mapp ohio suppression evidence however always last resort first impulse exclusionary rule generates substantial social costs leon sometimes include setting guilty free dangerous large therefore cautio us expanding colorado connelly repeatedly emphasized rule toll upon law enforcement objectives presents high obstacle urging application pennsylvania bd probation parole scott citation omitted rejected ndiscriminate application rule leon supra held applicable remedial objectives thought efficaciously served calandra deterrence benefits outweigh social costs scott supra quoting leon supra always speak guardedly expansive dicta mapp example suggested wide scope exclusionary rule see effect long since rejected approach explained arizona evans whiteley treated identification fourth amendment violation synonymous application exclusionary rule evidence secured incident violation subsequent case law rejected reflexive application exclusionary rule citation omitted said much leon decade earlier explained hether exclusionary sanction appropriately imposed particular case issue separate question whether fourth amendment rights party seeking invoke rule violated police conduct words exclusion may premised mere fact constitutional violation cause obtaining evidence cases show causality necessary sufficient condition suppression case course constitutional violation illegal manner entry cause obtaining evidence whether preliminary misstep occurred police executed warrant obtained discovered gun drugs inside house even illegal entry characterized cause discovering inside never held evidence poisonous tree simply come light illegal actions police segura see also stevens dissenting mechanically applied exclusionary rule every item evidence causal connection police misconduct rather cause causation logical sense alone ceccolini attenuated justify exclusion even early days exclusionary rule declined hold evidence poisonous tree simply come light illegal actions police rather apt question case granting establishment primary illegality evidence instant objection made come exploitation illegality instead means sufficiently distinguishable purged primary taint wong sun quoting maguire evidence guilt emphasis added attenuation occur course causal connection remote see nardone attenuation also occurs even given direct causal connection interest protected constitutional guarantee violated served suppression evidence obtained penalties visited upon government turn upon public officers violated law must bear relation purposes law serve ceccolini supra thus new york harris illegal warrantless arrest made harris house held suppressing harris statement taken outside house serve purpose rule made harris arrest illegal warrant requirement arrest home imposed protect home anything incriminating police gathered arresting harris home rather elsewhere excluded purpose rule thereby vindicated reason cases excluding fruits unlawful warrantless searches see boyd weeks silverthorne lumber mapp supra say nothing appropriateness exclusion vindicate interests protected requirement valid warrant issued citizens entitled shield persons houses papers effects amdt government scrutiny exclusion evidence obtained warrantless search vindicates entitlement interests protected requirement quite different include shielding potential evidence government eyes one interests protection human life limb unannounced entry may provoke violence supposed surprised resident see mcdonald jackson concurring see also sabbath miller another interest protection property breaking house old cases typically put absent announcement penalize someone know process notice presumed obey wilson quoting semayne case eng rule gives individuals opportunity comply law avoid destruction property occasioned forcible entry richards see also banks thirdly rule protects elements privacy dignity destroyed sudden entrance gives residents opportunity prepare entry police richards brief interlude announcement entry warrant may opportunity individual pull clothes get bed ibid words assures opportunity collect oneself answering door rule never protected however one interest preventing government seeing taking evidence described warrant since interests violated case nothing seizure evidence exclusionary rule inapplicable quite apart requirement unattenuated causation exclusionary rule never applied except deterrence benefits outweigh social costs scott quoting leon costs considerable addition grave adverse consequence exclusion relevant incriminating evidence always entails risk releasing dangerous criminals society imposing massive remedy violation generate constant flood alleged failures observe rule claims asserted richards justification entry see inadequate support cf singleton cost entering lottery small jackpot enormous suppression evidence amounting many cases card courts experience never reality exclusionary rule frequently requires extensive litigation determine whether particular evidence must excluded scott supra unlike warrant miranda requirements compliance readily determined either warrant either miranda warning given constituted reasonable wait time particular case banks supra matter many seconds police fact waited whether reasonable suspicion sort invoke richards exceptions difficult trial determine even difficult appellate review another consequence incongruent remedy hudson proposes police officers refraining timely entry knocking announcing observed see supra amount time must wait necessarily uncertain consequences running afoul rule massive officers inclined wait longer law requires producing preventable violence officers cases destruction evidence many others see gates deemed consequences severe enough produce unanimous agreement mere reasonable suspicion knocking announcing particular circumstances dangerous futile inhibit effective investigation crime cause requirement yield richards supra next substantial social costs must consider deterrence benefits existence necessary condition exclusion course sufficient condition follow fourth amendment requires adoption every proposal might deter police misconduct calandra see also leon supra begin value deterrence depends upon strength incentive commit forbidden act viewed perspective deterrence violations worth lot violation warrant requirement sometimes produces incriminating evidence otherwise obtained ignoring realistically expected achieve absolutely nothing except prevention destruction evidence avoidance resistance occupants premises dangers even reasonable suspicion existence suspend requirement anyway massive deterrence hardly required seems us even true hudson contends without suppression deterrence violations course even assertion accurate necessarily justify suppression assuming assertion must civil suit effective deterrent one think many forms police misconduct similarly undeterred example confessed suspect killing police officer arrested along incriminating evidence lawful warranted search subjected physical abuse station house seriously suggested evidence must excluded since effective deterrent civil suit effective deterrent police violation suspect sixth amendment rights denying prompt access counsel many regard violated rights significant right intruded upon one nightclothes yet nothing ineffective civil suit available deterrent police incentive violations arguably greater incentive disregarding rule assume exclusion context necessary deterrence simply found necessary deterrence different contexts long ago forcing public today pay sins inadequacies legal regime existed almost half century ago dollree mapp turn meaningful relief monroe pape began slow steady expansion remedy decided term mapp another years remedy extended reach deep pocket municipalities monell new york city dept social citizens whose fourth amendment rights violated federal officers bring suit years mapp decision bivens six unknown fed narcotics agents hudson complains hard find lawyer take case tr oral arg answers objection since violations yield damages small justify expense litigation congress authorized attorney fees plaintiffs remedy unavailable heydays jurisprudence tied availability cause action years mapp lawyers even consider representation persons civil rights claims police much changed citizens lawyers much willing seek relief courts police misconduct avery rudovsky blum police misconduct law litigation ed see generally aron liberty justice public interest law beyond describing growth law number law firms lawyers specialize grievances greatly expanded hudson points published decisions date announce huge awards violations unhelpful statistic even thought large damages deter police misconduct police somehow deterred damages indifferent prospect large attorney fees know many claims settled indeed many violations occurred produced anything nominal injury clear least lower courts allowing colorable suits go forward unimpeded assertions qualified immunity see green butler denying qualified immunity civil suit holland ex rel overdorff harrington mena simi valley gould davis far know civil liability effective deterrent assumed contexts see correctional services malesko threat litigation liability adequately deter federal officers bivens purposes matter may enjoy qualified immunity violators see also nix williams another development past deters violations increasing professionalism police forces including new emphasis internal police discipline even long ago felt proper assume unlawful police behavior dealt appropriately authorities payner increasing evidence police forces across take constitutional rights citizens seriously reforms education training supervision police officers walker taming system control discretion criminal justice numerous sources available teach officers supervisors required cases respect constitutional guarantees various situations craft effective regime internal discipline see waksman goodman search seizure handbook ed stone deluca police administration introduction ed thibault lynch mcbridge proactive police management ed failure teach enforce constitutional requirements exposes municipalities financial liability see canton harris moreover modern police forces staffed professionals credible assert internal discipline limit successful careers deterrent effect also evidence increasing use various forms citizen review enhance police accountability sum social costs applying exclusionary rule violations considerable incentive violations minimal begin extant deterrences substantial incomparably greater factors deterring warrantless entries mapp decided resort massive remedy suppressing evidence guilt unjustified iv trio cases segura new york harris ramirez confirms conclusion suppression unwarranted case like today case segura involved concededly illegal entry police conducting drug crime investigation waited segura outside apartment building arrived denied living police arrested brought apartment suspected illegal activity officer knocked someone inside opened door police entered taking segura neither warrant consent enter announce police entry illegal officers stayed apartment hours awaiting search warrant stevens dissenting alerted search warrant obtained police still inside secured premises evidence removed conducted search refused exclude resulting evidence recognized evidence gained particular violation excluded see therefore distinguished effects illegal entry effects legal search none information warrant secured derived related way initial entry petitioners apartment therefore beyond dispute information possessed agents entered apartment constituted independent source discovery seizure evidence challenged ibid search segura wholly unrelated prior entry entry warrantless bizarre treat harshly actions case entry warrant probable cause backing warrant issued later time independent source search proceeded officers illegally entered waited search warrant obtained going must least much second case harris police violated defendant fourth amendment rights arresting home without warrant contrary payton new york taken station house gave incriminating statement see refused exclude like illegal entry led discovery evidence today case illegal arrest harris began process culminated acquisition evidence sought excluded harris statement product arrest custody fruit fact arrest made house rather someplace else likewise acquisition gun drugs product search pursuant warrant fruit fact entry preceded knock ramirez supra involved claim police entry violated fourth amendment effected breaking window ultimately concluded property destruction circumstances reasonable course discussion unanimously said following estruction property course search may violate fourth amendment even though entry lawful fruits search subject suppression breaking window unreasonable said necessary determine whether sufficient causal relationship breaking window discovery guns warrant suppression evidence clearer expression proposition impermissible manner entry necessarily trigger exclusionary rule foregoing reasons affirm judgment michigan appeals ordered booker hudson petitioner michigan writ certiorari appeals michigan june justice kennedy concurring part concurring judgment two points underscored respect today decision first requirement protects rights expectations linked ancient principles constitutional order see wilson arkansas decision interpreted suggesting violations requirement trivial beyond law concern second continued operation exclusionary rule settled defined precedents doubt today decision determines specific context requirement violation sufficiently related later discovery evidence justify suppression basic right question privacy security home central fourth amendment guarantees explained decisions understood since beginnings republic common understanding ensures respect law allegiance institutions instrument transmitting constitution later generations undiminished meaning force bears repeating serious matter law enforcement officers violate sanctity home ignoring requisites lawful entry security must subject erosion indifference contempt system explains developed procedures training police officers imposing discipline failures act competently lawfully measures prove ineffective fortified detailed regulations legislation supplementing safeguards civil remedies available provide restitution discrete harms remedies apply violations including course exceptional cases unannounced entries cause severe fright humiliation suppression another matter precedents causal link violation requirement later search attenuated allow suppression cf ramirez application exclusionary rule depends existence sufficient causal relationship unlawful conduct discovery evidence example violation results want pause ensuing lawful search lasting five hours discloses evidence criminality failure wait door properly described caused discovery evidence today decision address demonstrated pattern violations widespread pattern violations shown particularly violations committed persons lacked means voice mount effective protest reason grave concern even however acknowledge extending remedy exclusion evidence seized following violation mean revising requirement causation limits discretion applying exclusionary rule type extension also significant practical implications adding list issues requiring resolution criminal trial questions whether police officers entered home waiting seconds case relevant evidence discovered failure subsequent search pursuant lawful warrant view correct hold suppression required convinced segura new york harris much relevance justice scalia appears conclude holding fully supported parts iii opinion accordingly join parts concur judgment booker hudson petitioner michigan writ certiorari appeals michigan june justice breyer justice stevens justice souter justice ginsburg join dissenting wilson arkansas unanimous held fourth amendment normally requires law enforcement officers knock announce presence entering dwelling today opinion holds evidence seized home following violation requirement need suppressed result destroys strongest legal incentive comply constitution requirement without significant support precedent least find support many fourth amendment cases decided near century since first set forth exclusionary principle weeks see appendix infra today opinion thus doubly troubling represents significant departure precedents weakens perhaps destroys much practical value constitution protection set forth legal principles determined outcome case two sets basic fourth amendment cases shall begin describing underlying case law first set cases describes constitutional requirement requirement initially set forth years ago wilson arkansas supra cf sabbath suppressing evidence seized violation federal statutory requirement miller wilson tracing lineage rule back century wrote examination common law search seizure leaves doubt reasonableness search dwelling may depend part whether law enforcement officers announced presence authority prior entering noted basic principle agreed upon everal prominent commentators woven quickly fabric early american law via state constitutions statutes concluded little doubt framers fourth amendment thought method officer entry dwelling among factors considered assessing reasonableness search seizure held announce principle forms part reasonableness inquiry fourth amendment thus search seizure dwelling might constitutionally defective police officers enter without prior announcement see banks ramirez richards wisconsin second set cases sets forth certain principles relevant include boyd seminal fourth amendment case decided years ago wrote frequently quoted language fourth amendment prohibitions apply invasions part government employés sanctity man home privacies life breaking doors rummaging drawers constitutes essence offence invasion indefeasible right personal security personal liberty private property weeks supra case decided years boyd originated exclusionary rule held federal government retain evidence seized unconstitutionally use evidence federal criminal trial pointed letters private documents unlawfully seized home used evidence citizen accused offense protection fourth amendment declaring right secure searches seizures value might well stricken constitution silverthorne lumber case created exception qualification weeks exclusionary rule held government use information obtained illegal search subpoena documents illegally viewed search writing justice holmes noted exclusionary rule mean facts unlawfully obtained become sacred inaccessible knowledge gained independent source may proved like others describing related inevitable discovery exception wolf colorado mapp ohio cases considered whether weeks exclusionary rule applies wolf held said security one privacy arbitrary intrusion police implicit concept ordered liberty enforceable due process clause held exclusionary rule enforceable essential ingredient right mapp overruled wolf experience said showed alternative methods enforcing fourth amendment requirements failed see see people cahan cal traynor experience california demonstrated however neither administrative criminal civil remedies effective suppressing lawless searches seizures consequently held evidence obtained searches seizures violation constitution authority inadmissible state mapp hold otherwise added grant right reality withhold privilege enjoyment ii reading cases part supra light foundational fourth amendment case law part supra clear exclusionary rule apply one thing elementary logic leads conclusion held must conside whether officers complied requirement assessing reasonableness search seizure wilson emphasis added see banks fourth amendment insists unreasonable search seizure constitutionally speaking illegal search seizure ever since weeks respect federal prosecutions mapp respect state prosecutions use evidence secured illegal search seizure barred criminal trials wolf supra citing weeks see mapp supra another thing driving legal purpose underlying exclusionary rule namely deterrence unlawful government behavior argues strongly suppression see elkins purpose exclusionary rule deter compel respect constitutional guaranty removing incentive disregard weeks silverthorne mapp based holdings requiring suppression unlawfully obtained evidence upon recognition admission evidence seriously undermine fourth amendment promise three cases recognized failure apply exclusionary rule make promise hollow one see mapp supra reducing form words silverthorne supra value seeks protect weeks supra indeed mapp held exclusionary rule applies large part due belief alternative state mechanisms enforcing fourth amendment guarantees proved worthless futile application exclusionary rule less necessary without rule mapp police know ignore constitution requirements without risking suppression evidence discovered unreasonable entry mapp government officers find easier believe less risky proceed consider necessary search immediately without requisite constitutional say warrant compliance cf mericli apprehension peril exception knock announce rule part search seizure hereinafter mericili noting rug enforcement authorities believe safety police lies swift surprising entry overwhelming force announcing official authority course state federal government may provide alternative remedies violations circumstance true mapp well reason believe remedies private damages actions found inadequate mapp adequately deter unconstitutional police behavior see kamisar defense search seizure exclusionary rule harv pub arguing five decades inhibiting effect federal exclusionary rule failed produce meaningful alternative exclusionary rule jurisdiction evidence times changed cases reporting violations legion see geo ann rev crim proc collecting appeals cases collecting cases brief petitioner collecting federal state cases indeed cases reported violations seem sufficiently frequent serious indicate widespread pattern ante kennedy concurring part concurring judgment yet majority like michigan failed cite single reported case plaintiff collected nominal damages solely result violation even michigan concedes cases like present one damages may virtually brief respondent michigan amici concede civil immunities prevent tort law effective substitute exclusionary rule time brief criminal justice legal foundation see also hope pelzer difficulties overcoming qualified immunity defenses justice stewart author number significant fourth amendment opinions explained deterrent effect damage actions hardly said great actions expensive readily available rarely successful stewart road mapp ohio beyond origins development future exclusionary rule cases colum rev upshot need deterrence critical factor driving fourth amendment cases close century argues least comparable strength evidentiary exclusion argue majority new remedies actions better trained police make suppression unnecessary argue wolf mapp law recently rejected similar argument dickerson argue may civil suits violations may produce nothing nominal injury confirm deny inability civil suits deter violations see ante argue without evidence despite myriad reported cases violations reported case civil damages michigan concession nonexistence civil suits may provide deterrence claims may settled perhaps search desperation argument see ibid rather majority candidly admits simply assumed far know civil liability effective deterrent assumption mapp subsequent cases make clear embody normal approach difficult questions fourth amendment law surprising looking virtually every pertinent case decided since weeks find precedent might offer majority support contrary conclusion course recognized every fourth amendment violation necessarily triggers exclusionary rule ante cf illinois gates application exclusionary rule separate question whether fourth amendment violated class fourth amendment violations result suppression evidence seized however limited declined apply exclusionary rule specific reason believe application rule result appreciable deterrence janis see leon exception searching officer executes defective search warrant good faith arizona evans exception clerical errors employees walder exception impeachment purposes admissibility proceedings criminal trials issue see pennsylvania bd probation parole scott exception parole revocation proceedings ins plurality opinion exception deportation proceedings janis supra exception civil tax proceedings calandra exception grand jury proceedings stone powell exception federal habeas proceedings neither two exceptions applies second apply case ordinary criminal trial first apply officers violate rule acting reasonable officer act similar circumstances leon supra case involve government employees police evans supra importantly key rationale exception lack deterrence missing see pennsylvania bd probation supra noting rationale applying rule noncriminal cases deterrence achieved rule apply contexts minimal application rule criminal trial context already provides significant deterrence unconstitutional searches michigan tucker noting deterrence rationale served rule applied police officers acting good faith deterrent purpose exclusionary rule necessarily assumes police engaged willful least negligent conduct critical latter rationale underlies every exception apply reason think case violations police exclusion evidence trial sufficiently deter future errors evans supra ends exclusionary rule appreciable way leon supra aware basis exception decided fourth amendment cases since weeks found constitutional violations nearly third see greenhalgh fourth amendment handbook chronological survey decisions ed collecting summarizing cases decided nature constitutional violation varies instances officers lacked warrant others officers possessed warrant based false affidavits still others officers executed search unconstitutional manner every case involving evidence seized illegal search home federally since weeks nationally since mapp exceptions mentioned either explicitly implicitly upheld required suppression evidence trial see appendix infra one cases questio absence efficacious sanction continued application exclusionary rule suppress evidence state case criminal trial franks delaware find nothing persuasive majority opinion justify refusal apply rule ly justification exception majority finds find odd instances areas law automatically demand suppression ante suspect confesses police beat afterwards pect confesses police apparently arrest take station refuse tell right counsel justify exception say police may knock door anyway avoid mistaken burglar police believing quick entry secure effective entry voluntarily cf mericli describing special weapons tactics swat team practices balko swat apr available http internet materials visited june available clerk case file neither majority justify failure respect need deterrence set forth consistently prior case law claim substantial social costs least means social costs somehow special costs mentions typically accompany use fourth amendment exclusionary principle constable blunders guilty defendant may set free consider mapp defendants may assert claims fourth amendment rights uncertain consider qualified immunity jurisprudence sometimes difficult decide merits uncertain claims see ante fact warrants provided many diminishing uncertainty may make application principle less cost ly whole application comparable fourth amendment principles determining whether particular warrantless search justified exigency majority substantial social costs argument argument fourth amendment exclusionary principle argument consistently rejected iii majority michigan make several additional arguments view arguments rest upon misunderstandings principles underlying precedents majority first argues constitutional violation illegal manner entry cause obtaining evidence ante taking causation commonly understood law see see keeton dobbs keeton owen prosser keeton law torts ed although police might entered hudson home lawfully fact unlawful behavior inseparably characterizes actual entry entry necessary condition presence hudson home presence hudson home necessary condition finding seizing evidence time discovery evidence hudson home readily foreseeable consequence entry unlawful presence within home cf restatement second torts moreover separating manner entry related search slices violation finely noted part supra described failure comply rule independently unlawful event factor renders search constitutionally defective wilson opinion brennan lawful entry indispensable predicate reasonable search nonetheless accepts michigan argument requisite satisfied case whether constitutional violation occurred refers preliminary misstep police executed warrant obtained discovered gun drugs inside house ante support proposition michigan rests inevitable discovery cases claim however misunderstands inevitable discovery doctrine justice holmes silverthorne discussing independent source exception set forth principles underlying inevitable discovery rule see supra rule refer discovery taken place police behavior question contrary fact lawful doctrine treat critical hypothetically happened police acted lawfully first place rather independent inevitable discovery refers discovery occur occurred despite simply absence unlawful behavior independently unlawful behavior government example avoid suppression evidence seized without warrant pursuant defective warrant simply showing obtained valid warrant sought one see coolidge new hampshire instead must show evidence inevitably discovered lawful means nix williams emphasis added man austin ifs cans proceedings british academy inevitable discovery exception rests upon principle remedial purposes exclusionary rule served suppressing evidence discovered later lawful seizure genuinely independent earlier tainted one murray emphasis added see also marshall joined stevens dissenting seizure evidence issue independent constitutional violation exclusion arguably effect law enforcement officer incentive commit unlawful search case law well illustrates meaning principle nix supra police officers violated defendant sixth amendment right eliciting incriminating statements invoked right counsel statements led discovery victim body concluded evidence obtained victim body admissible ultimately inevitably discovered volunteer search party effort ongoing whether sixth amendment violation taken place words evidence found despite independent sixth amendment violation segura one trio cases justice scalia says confirms conclusion ante held earlier illegal entry apartment require suppression evidence police later seized executing search warrant obtained basis information unconnected initial entry reasoned evidence discovered day following entry search conducted valid warrant warrant obtained independently without use information found illegal entry product search wholly unrelated prior unlawful entry segura supra emphasis added murray supra upheld admissibility seized evidence agents entered warehouse without warrant later returned valid warrant obtained basis evidence observed first illegal entry reasoned agents nowledge marijuana warehouse assuredly acquired time unlawful entry also acquired time entry pursuant warrant later acquisition result earlier entry reason independent source doctrine apply emphasis added thus opinion reflects misunderstanding inevitable discovery means says case course constitutional violation illegal manner entry cause obtaining evidence ante majority rests conclusion next statement whether preliminary misstep occurred police discovered gun drugs inside house ibid despite phrase course neither statements correct true illegal entry occurred police discovered guns drugs inside house without unlawful entry inside house discovery see supra course police entered house lawfully found gun drugs fact beside point question police might done behaved unlawfully question set motion independent chain events inevitably led discovery seizure evidence despite independent behavior answer majority michigan point officers possessed warrant authorizing search ante fact argue means evidence discovered independently somehow diminishes need suppress evidence see warrant question warrant many michigan issue assure police prior knock necessary richards collecting state statutes authorize search fails comply requirements rather ordinary search warrant authorized search complied search disregarded constitution rule warrant authorizes entry home tuesday permit police enter monday warrant authorizes entry day authorize police enter middle night difficult see presence warrant authorize entry question anything inevitable discovery exception otherwise diminishes need enforce requirement suppression majority set forth variant causal connection theme argues law suppress evidence insofar fourth amendment violation causes kind harm particular fourth amendment rule seeks protect adds constitutional purpose rule prevent needless destruction property breaking door avoid unpleasant surprise concludes exclusionary rule suppress evidence say damage property discovery defendant intimate compromising moment excited utterance occupant caught surprise nothing brief amicus curiae majority makes similar argument says evidence suppressed causal connection unlawful behavior discovery evidence becomes attenuated ante majority makes clear using word attenuated mean precedents typically used word mean namely discovery evidence come long unlawful behavior took place independent way sufficiently distinguishable purged primary taint wong sun see brown illinois rather majority gives word attenuation new meaning thereby effect making argument attenuation says also occurs even given direct causal connection interest protected constitutional guarantee violated served suppression evidence obtained ante interests rule seeks protect adds human life stake householder surprised property front door elements privacy dignity destroyed sudden entrance namely opportunity collect oneself answering door ante since none interests led discovery evidence seized reason suppress three serious problems argument first fully describe constitutional values purposes objectives underlying requirement rule help protect homeowners damaged doors help protect occupants surprise protects occupants privacy assuring government agents enter home without complying requirements among others diminish offensive nature intrusion many years ago justice frankfurter wrote knock door prelude search authority law inconsistent conception human rights enshrined history constitution wolf much offensive search takes place without knock cf wilson rule recognizes common law generally protected man house castle defence asylum quoting blackstone commentaries miller federal statute codif ied tradition embedded law reflected reverence law individual right privacy house century ago wrote breaking doors essence offence invasions part government sanctity man home privacies life boyd kennedy concurring requirement less part principle special protection privacy home warrant requirement see slip citing miller supra therefore wrong reduce essence protection right intruded upon one nightclothes ante see richards ndividual privacy interest protected rule inconsequential unduly minimized second whether interests underlying rule implicated given case sense beside point explained failure comply rule renders related search unlawful wilson supra search unlawful law insists upon suppression evidence consequently discovered even evidence possession little nothing reasons underlying unconstitutionality search fourth amendment seek protect contraband yet required suppression contraband seized unlawful search see kyllo coolidge true third majority approach departs prior law ordinarily simply look see unconstitutional search produced evidence majority refer relevant case beyond suppression turned far detailed relation say particular materially false statement made magistrate issued consequently invalid warrant evidence found search warrant cf ante plurality opinion citing new york harris case section opinion justice kennedy join majority failure surprise efforts trace causal connections retail well complicate fourth amendment suppression law threatening workability brief oral argument argued suppression especially harsh remedy given nature violation case brief amicus curiae see also argument focuses upon fact entering house knocking announcing cases prove dangerous police officer perhaps someone inside gun turned case majority adds police officers encounter someone may try harm uncertain long wait ante says consequences running afoul rule massive lead exclusion evidence officers inclined wait longer law requires producing preventable violence officers cases ante argue police efforts assure compliance rule may prove dangerous however argue evidence suppression argue validity rule similarly argue enforcement means uncertainty turn means potential dangerous delay true argue meaningful compliance rule answer first argument rule require police knock announce presence police reasonable suspicion dangerous futile inhibit effective investigation crime example allowing destruction evidence richards supra see banks wilson supra answer second argument many reduce police uncertainty assuring neutral evaluation concerns risks officers destruction evidence permitting police obtain search warrant magistrate judge thereby assuring police prior announcement necessary richards collecting state statutes procedure remove uncertainty provide easy way officers comply rule course even without warrant police maintain backup authority exercise independent judgment concerning wisdom entry time warrant executed ibid circumstances support reasonable suspicion exigency officers arrive door may go straight banks supra easonable suspicion less demanding standard probable cause alabama white see terry ohio fourth amendment violation reasonable suspicion standard facts available officer moment seizure search man reasonable caution belief action taken appropriate consider case police obtained search warrant authorized search drugs also guns app probable cause justified search guns also justified warrant thereby diminishing danger officers state michigan lacks warrants justified entry issue indeed prosecutor argue case given likelihood guns entry lawful seen record suppression right way win process arguing merits violation help clarify contours rule contours majority believes fuzzy procedural fact along warrants back authority enter without knocking regardless use reasonable suspicion standard resolve government problems rule reducing uncertain ty majority discusses levels beneath found elsewhere fourth amendment law exigent circumstances ante regardless fears effective enforcement constitutional requirement harmful consequences face fears directly addressing requirement argue requirement fine indeed serious matter enforce apparent three cases upon justice scalia relies segura new york harris ramirez support conclusion see ante indeed justice kennedy declines join section lead opinion fails see relevance segura harris though rely ramirez ante opinion concurring part concurring judgment justice scalia first argues search segura unrelated prior entry entry warrantless bizarre treat harshly actions case entry warrant ante says probable cause backing warrant issued later time source search proceeded officers illegally entered waited search warrant obtained going must least much effect ibid understand arguments explained presence warrant authorize search fails comply requirements beside point see part supra timing warrant segura made difference case relevant fact warrant lawfully obtained arguably set independent chain events led police seize evidence see also valid warrant search sufficiently distinguishable purge evidence arising entry citations omitted noted independent event intervening chain events purge taint illegal entry present see supra search produced relevant evidence search violation rendered unlawful simply independent source importantly segura said nothing suggest intended create major exclusionary rule exception notwithstanding impact exception deterrence indeed exception inconsistent critical rationale underlying independent source inevitable discovery rules arguably available segura clearly absent rationale concerns deterrence threat inadmissibility deters unlawful police behavior existence exception applicable evidence found untainted independent route rarely undercut deterrence police rarely rely upon exception least often enough change deterrence calculus see murray see incentives differently officer probable cause sufficient obtain search warrant foolish enter premises unlawful manner risk suppression evidence premises nix police officer faced opportunity obtain evidence illegally rarely ever position calculate whether evidence sought inevitably discovered prosecution establish preponderance evidence information ultimately inevitably discovered lawful means volunteers search deterrence rationale little basis evidence received segura police officers foolish entered apartment unlawfully ex ante hope independent causal chain events later occur render admissible evidence found way contrast today holding seriously undermine deterrence cases officers almost always know ex ante ignore requirement without risking suppression evidence discovered unlawful entry fact obvious never today segura case refused apply exclusionary rule absence clearly significantly impair government officials incentive comply comparable fourth amendment requirements neither new york harris supra support result see ante see ante opinion kennedy declining join section relying harris harris police officers arrested defendant home without warrant violation payton new york harris made several incriminating statements confession home written inculpatory statement stationhouse videotaped interview conducted district attorney stationhouse trial suppressed statements given harris house videotape state challenge either rulings ibid sole question case whether written statement given later stationhouse also suppressed held later statement admissible harris legal custody statement product arrest custody fruit fact arrest made house rather someplace else immediately stated holding explained put matter another way suppressing statement taken outside house serve purpose rule made harris arrest illegal warrant requirement arrest home imposed protect home anything incriminating police gathered arresting harris home rather elsewhere excluded purpose rule thereby vindicated ibid emphasis added justice scalia maintain evidence gun drugs seized home illegal entry ante officers failure knock announce rendered entire search unlawful wilson unlawful search led discovery evidence petitioner home thus harris compels opposite result reached today like payton rule issue harris rule reflects reverence law individual right privacy house miller cf harris payton emphasized holding case stemmed respect sanctity home embedded traditions since origins like confession excluded harris evidence case seized home immediately following illegal entry like harris nothing petitioner argument require suppression evidence obtained outside home following violation suppressed precisely officers remaining incentive follow rule avoid suppression evidence obtained place searching cf ibid even though decline suppress statements made outside home following payton violation principle incentive obey payton still obtains police know warrantless entry lead suppression evidence found statements taken inside home concede ramirez offers majority last best hope ante even case offer majority significant support majority focuses isolated statement destruction property course search may violate fourth amendment even though entry lawful fruits search subject suppression ramirez supra emphasis added even accept dictum entry unlawful lawful wilson one thing say appropriate case destruction property proper entry nothing discovery evidence refuse suppress quite another thing say improper entry nothing discovery evidence case moreover deterrence analysis property destruction cases definition almost always quantifiable damages might well differ iv perhaps one additional argument implicit majority approach majority says example cost defendant entering lottery claiming violation small jackpot enormous namely potential card ante adds social costs applying exclusionary rule worth deterrence benefits ante leaving aside believe invalid arguments based precedent majority estimate suppression necessary deter constitutional violations one left simple unvarnished conclusion namely kind case case esort massive remedy suppressing evidence guilt unjustified ibid judicial judgment taken inappropriate argued rule subsidiary fourth amendment rule simply important enough warrant suppression remedy majority simply claim suppression game worth candle answer believe reflects history history shows rule important see wilson supra reflects precedent precedent shows legal category exceptions exclusionary rule cases might fit see supra reflects empirical fact experience provides confirmation common sense suggests without suppression little deter violations see supra may instances law text history tradition leaves room judicial decision rests upon little unvarnished judicial instinct one rather fourth amendment traditions place high value upon protecting privacy home emphasize need assure constitutional protections effective lest amendment word promise ear break hope include exclusionary principle since weeks formed centerpiece criminal law effort ensure practical reality promises assure departure principle firmly grounded logic history precedent empirical fact done respect dissent appendix opinion breyer fourth amendment decisions present requiring suppression evidence seized remanding lower make suppression determination private home following illegal arrest search weeks warrantless search amos warrantless arrest search agnello warrantless search byars invalid warrant berkeness invalid warrant insufficient affidavit taylor warrantless search grau invalid warrant insufficient affidavit nathanson invalid warrant insufficient affidavit mcdonald warrantless arrest search kremen per curiam warrantless search elkins search beyond scope warrant silverman warrantless use electronic device chapman warrantless search mapp ohio warrantless search wong sun warrantless search arrest fahy connecticut warrantless search aguilar texas invalid warrant insufficient affidavit stanford texas invalid warrant particularity defect james louisiana per curiam warrantless search riggan virginia per curiam invalid warrant insufficient affidavit bumper north carolina lack valid consent search recznik city lorain per curiam warrantless search chimel california invalid search incident arrest von cleef new jersey per curiam invalid search incident arrest shipley california per curiam invalid search incident arrest vale louisiana invalid search incident arrest connally georgia per curiam invalid warrant magistrate judge neutral michigan tyler warrantless search mincey arizona warrantless search franks delaware invalid warrant obtained perjury payton new york warrantless arrest steagald warrantless search michigan clifford warrantless search welsh wisconsin warrantless entry home without exigent circumstances thompson louisiana per curiam warrantless search arizona hicks unreasonable search minnesota olson warrantless entry home flippo west virginia per curiam warrantless search kyllo warrantless use technology kirk louisiana per curiam warrantless arrest search kaupp texas per curiam warrantless search footnotes justice breyer insistence warrant segura obtained independently without use information found illegal entry post dissenting opinion entirely fails distinguish warrant present case similarly inapposite appeal justice frankfurter statement wolf colorado knock door prelude search without authority law inconsistent conception human rights enshrined history see post much offensive justice breyer asserts search takes place without knock ibid entry without authority law without search warrant describes case segura evidence admitted anyway justice breyer assertion segura unlike decision present case effect deterrence see post comport views segura dissent see stevens dissenting disposition fear provide government agents affirmative incentive engage unconstitutional violations privacy home harris undermines two key points dissent first claim whether interests underlying rule implicated given case sense beside point post flatly refuted harris plain statement reason rule must govern sanctions rule violation see also supra second dissent attempt turn harris vindication sanctity home see post whole point case confession police obtained illegally removing man sanctity home admissible