gade solid wastes mgmt argued march decided june pursuant authority contained occupational safety health act osh act act occupational safety health administration osha promulgated regulations implementing requirement superfund amendments reauthorization act sara standards set initial routine training workers handle hazardous wastes subsequently illinois enacted two acts requiring licensing workers certain hazardous waste facilities state act dual purpose protecting workers general public requires workers meet specified training examination requirements claiming among things acts osh act osha regulations respondent association businesses involved inter alia hazardous waste management sought injunctive relief petitioner gade predecessor director state environmental protection agency prevent enforcement state acts district held state acts protected public safety addition promoting job safety invalidated provisions acts appeals affirmed part reversed part holding osh act state law constitutes direct clear substantial way regulation worker health safety unless secretary labor explicitly approved law pursuant osh act remanding consider provisions held judgment affirmed affirmed justice delivered opinion respect parts iii iv concluding state law requirement directly substantially specifically regulates occupational safety health occupational safety health standard within meaning osh act regardless whether another nonoccupational purpose assessing state law impact federal scheme refused rely solely legislature professed purpose looked well law effects see perez campbell state laws general applicability traffic fire safety laws generally regulate workers simply members general public pp state licensing acts osh act extent establish occupational safety health standards training work hazardous wastes act saving provisions implicated illinois approved plan illinois interest establishing standards licensing various occupations goldfarb virginia state bar save osh act provisions directly substantially affect workplace safety since state law however clearly within state acknowledged power must yield interferes contrary federal law felder casey acts saved gade argument regulate precondition employment rather occupational safety health since sara makes clear training employees engaged hazardous waste operations occupational safety health issue certification requirements employee may engage work occupational safety health standards specifically consider licensing acts provisions foregoing analysis justice joined chief justice justice white justice scalia concluded part ii osh act impliedly state regulation occupational safety health issue respect federal standard established unless state plan submitted approved pursuant act act whole demonstrates congress intended promote occupational safety health avoiding subjecting workers employers duplicative regulation thus established system uniform federal standards gave option federal regulations entirely pursuant approved state plan displaces federal standards intent indicated principally statement state shall submit plan wishes assume responsibility developing enforcing health safety standards gade interpretation secretary approval required state wishes replace merely supplement federal regulations inconsistent federal scheme untenable light surrounding provisions language purposes confirm view assume enforcement role without secretary approval unless federal standard effect also unacceptable gade argument osh act nonconflicting state laws laws like act designed promote worker safety even laws share common goal state law interferes methods federal statute intended reach goal international paper ouellette act foreclose state enacting laws restrict ways pp justice kennedy agreeing state laws concluded result mandated express terms osh act scope also defined statutory text finding contrary longstanding rule infer historic police powers absent clear statement intent congress unartful though language may structure language conjunction subsections leave little doubt osh act congress intended supplementary state regulation occupational safety health issue respect federal standard exists pp john simon assistant attorney general illinois argued cause petitioner briefs roland burris attorney general rosalyn kaplan solicitor general tanya solov assistant attorney general donald bliss argued cause respondent brief arthur culvahouse bruce parker john van gessel william kelley argued cause pro hac vice amicus curiae urging affirmance brief solicitor general starr deputy solicitor general mahoney allen feldman steven mandel nathaniel spiller briefs amici curiae urging reversal filed state new york et al robert abrams attorney general new york jerry boone solicitor general jane lauer barker richard corenthal assistant attorneys general attorneys general respective follows richard blumenthal connecticut charles oberly iii delaware michael carpenter maine joseph curran maryland scott harshbarger massachusetts frank kelley michigan robert del tufo new jersey lee fisher ohio american federation labor congress industrial organizations marsha berzon laurence gold briefs amici curiae urging affirmance files chamber commerce glen nager robert gombar stephen bokat robin conrad mona zieberg flavor extract manufacturers association et al daniel thompson john mckenna washington legal foundation daniel popeo richard samp justice announced judgment delivered opinion respect parts iii iv opinion respect part ii chief justice justice white justice scalia join illinois general assembly enacted hazardous waste crane hoisting equipment operators licensing act ch hazardous waste laborers licensing act ch together licensing acts stated purpose licensing acts promote job safety protect life limb property case consider whether dual impact statutes protect workers general public federal occupational safety health act stat et seq osh act standards promulgated thereunder occupational safety health administration osha osh act authorizes secretary labor promulgate federal occupational safety health standards superfund amendments reauthorization act sara congress directed secretary labor promulgate standards health safety protection employees engaged hazardous waste operations pursuant authority osh act sara title stat codified note following relevant part sara requires secretary establish standards initial routine training workers handle hazardous wastes response congressional directive osha secretary delegated certain statutory responsibilities see martin occupational safety health review promulgated regulations hazardous waste operations emergency response including detailed regulations worker training requirements interim regulations final regulations codified cfr osha regulations require among things workers engaged activity may expose hazardous wastes receive minimum hours instruction site minimum three days actual field experience supervision trained supervisor workers site occasionally working areas determined permissible exposure limits must complete least hours instruction one day actual field experience ii iii managers supervisors directly responsible hazardous waste operations must receive initial training general employees plus least eight additional hours specialized training various health safety programs employees supervisors required receive eight hours refresher training annually satisfied training field experience requirement receive written certification uncertified workers prohibited engaging hazardous waste operations osha interim hazardous waste regulations effect state illinois enacted licensing acts issue laws designated acts relation environmental protection stated aim protect employees general public licensing hazardous waste equipment operators laborers working certain facilities licensing acts require license applicant provide certified record least hours training approved program conducted within illinois pass written examination complete annual refresher course least eight hours instruction ch addition applicants hazardous waste crane operator license must submit certified record showing operation equipment used hazardous waste handling minimum hours employees work without proper license employers knowingly permit unlicensed employee work subject escalating fines offense respondent case national solid wastes management association association national trade association businesses remove transport dispose handle waste material including hazardous waste association members subject osh act osha regulations therefore required train qualify certify hazardous waste remediation workers cfr hazardous waste operations conducted illinois certain workers employed association members also required obtain licenses pursuant illinois licensing acts thus example association members must ensure employees receive days field experience required certification osha regulations also days experience hours required licensing state statutes shortly state licensing acts due go effect association brought declaratory judgment action district bernard killian former director illinois environmental protection agency iepa petitioner mary gade killian successor office substituted party pursuant rule association sought enjoin iepa enforcing illinois licensing acts claiming acts osh act osha regulations violated commerce clause constitution district held state laws attempt regulate workplace safety health osh act laws legitimate substantial purpose apart promoting job safety app pet cert applying standard district held illinois licensing acts protected public safety addition promoting job safety indicated uphold state regulation implementing experience requirement long conflict federal regulations reasonable conclude workers satisfy requirement better skilled better skilled means fewer accidents equals less risk public safety environment time district invalidated requirement applicants hazardous waste license trained within illinois ground provision contribute illinois stated purpose protecting public safety declined consider association commerce clause challenge lack ripeness appeal appeals seventh circuit affirmed part reversed part national solid wastes management assn killian appeals held osh act state law constitutes direct clear substantial way regulation worker health safety unless secretary explicitly approved state law many regulations mandated illinois licensing acts yet reached final form appeals remanded case district without considering illinois provisions made clear however view illinois regulate worker health safety guise environmental regulation rejected district conclusion state experience requirement survive simply rule might also enhance public health safety ibid writing separately judge easterbrook expressed doubt osh act nonconflicting state laws concluded however osh act state law majority employed appropriate test determining whether illinois licensing acts superseded granted certiorari resolve conflict decision decisions courts appeals found osh act much narrower effect dual impact state regulations see associated industries massachusetts snow environmental encapsulating new york city manufacturers assn knepper cert denied new jersey state chamber commerce hughey ii addressing scope osh act dual impact state regulations consider petitioner threshold argument drawn judge easterbrook separate opinion act nonconflicting state regulations question whether certain state action federal law one congressional intent purpose congress ultimate touchstone lueck quoting malone white motor discern congress intent examine explicit statutory language structure purpose statute mcclendon slip see also fmc holliday osh act congress endeavored assure far possible every working man woman nation safe healthful working conditions end congress authorized secretary labor set mandatory occupational safety health standards applicable businesses affecting interstate commerce thereby brought federal government field traditionally occupied federal regulation workplace intended encompassing however first congress expressly saved two areas federal section osh act act supersede manner affect workmen compensation law enlarge diminish affect manner common law statutory rights duties liabilities employers employees law respect injuries diseases death employees arising course employment section provides act prevent state agency asserting jurisdiction state law occupational safety health issue respect federal standard effect congress reserved certain areas state regulation also act gave option federal regulation entirely section provides submission state plan development enforcement state standards applicable federal standards state time desires assume responsibility development enforcement therein occupational safety health standards relating occupational safety health issue respect federal standard promulgated secretary osh act shall submit state plan development standards enforcement decision appeals held unquestionably state law regulation establishes occupational health safety standard issue osha already promulgated standard unless state obtained secretary approval plan every federal state confronted osh act challenge reached conclusion preemption may either expressed implied compelled whether congress command explicitly stated statute language implicitly contained structure purpose jones rath packing shaw delta air lines fidelity fed sav loan assn de la cuesta absent explicit language recognized least two types implied field scheme federal regulation pervasive make reasonable inference congress left room supplement quoting rice santa fe elevator conflict compliance federal state regulations physical impossibility florida lime avocado growers paul state law stands obstacle accomplishment execution full purposes objectives congress hines davidowitz felder casey perez campbell principal indication congress intended state law statement state shall submit plan wishes assume responsibility development enforcement occupational safety health standards relating occupational safety health issue respect federal standard promulgated unavoidable implication provision state may enforce occupational safety health standards without obtaining secretary approval petitioner concedes require approved plan illinois wanted assume responsibility regulation occupational safety health within state petitioner contends however approved plan necessary state wishes completely replace federal regulations merely supplement argues correct interpretation posited judge easterbrook state may either oust federal standard submitting state plan secretary approval add federal standard without seeking secretary approval easterbrook dubitante petitioner interpretation might plausible interpret provision isolation simply tenable light osh act surrounding provisions must guided single sentence member sentence look provisions whole law dedeaux supra internal quotation marks citations omitted osh act whole evidences congress intent avoid subjecting workers employers duplicative regulation state may develop occupational safety health program tailored needs willing completely displace applicable federal regulations cutting petitioner interpretation language saves state law regulating occupational safety health issue respect federal standard effect although saving clause clause natural implication provision state laws regulating issue federal laws saved even merely supplement federal standard moreover petitioner reading correct state free enact nonconflicting safety health regulations superfluous possibility conflict federal regulation duty give effect possible every clause word statute menasche quoting montclair ramsdell conclude preservation state authority absence federal standard presupposes background state occupational safety health standards whenever federal standard governing issue effect understanding implications likewise bolstered act sets forth conditions must satisfied secretary approve plan submitted state subsection state standards affect interstate commerce approved required compelling local conditions unduly burden interstate commerce state supplement federal regulations without undergoing approval process protections offers interstate commerce easily undercut make little sense impose condition state programs intended supplant federal regulation merely supplement burden interstate commerce remains section also confirms view permitted assume enforcement role without secretary approval unless federal standard effect provision gives secretary authority withdraw approval state plan approval withdrawn plan cease effect state permitted assert jurisdiction occupational health safety law cases commenced withdrawal plan ibid petitioner reading permit continued exercise state jurisdiction purely supplemental nonconflicting standards instead assumes state loses power enforce occupational safety health standards approval withdrawn assumption exclusive federal jurisdiction absence approved state plan apparent transitional provisions contained act section authorized secretary labor first two years passage act enter agreement state state permitted continue enforce occupational health safety standards two years final action taken secretary pursuant whichever earlier significantly say agreement necessary state wishes fully supplant federal standards indeed original senate version provision allowed state enter agreement wished enforce standards conflict federal occupational health safety standards category included state occupational health safety standard provides stringent health safety regulations federal standards reprinted although provision eliminated final draft bill thereby allowing agreements temporary enforcement less stringent state standards indicative congressional understanding state required enter transitional agreement even standards stricter federal standards secretary contemporaneous interpretation also expresses understanding see cfr section permits secretary provide alternative exclusive federal jurisdiction occupational safety health issue alternative temporary may considered step toward permanent alternative exclusive federal jurisdiction provided sections following submission approval plan submitted state development enforcement occupational safety health standards emphases added looking provisions whole conclude osh act precludes state regulation occupational safety health issue respect federal standard established unless state plan submitted approved pursuant review act persuades us congress sought promote occupational safety health time avoiding duplicative possibly counterproductive regulation thus established system uniform federal occupational health safety standards gave option federal regulations developing occupational safety health programs addition congress offered substantial federal grant monies assist developing programs see osh act three years following enactment secretary may award costs state developing state occupational safety health plan develop approved plans may receive funding costs operating occupational health safety programs allow state selectively supplement certain federal regulations ostensibly nonconflicting standards inconsistent federal scheme establishing uniform federal standards one hand encouraging assume full responsibility development enforcement osh programs accept petitioner argument osh act nonconflicting state laws laws like act designed promote worker safety determining whether state law stands obstacle full implementation federal law hines davidowitz enough say ultimate goal federal state law international paper ouellette state law also interferes methods federal statute designed reach th goal ibid see also michigan canners freezers agricultural marketing bargaining state statute establishing association represent agricultural producers even though federal agricultural fair practices act share goal augmenting producer bargaining power wisconsin dept industry gould state statute preventing violators national labor relations act business state even though state law designed reinforce requirements federal act osh act foreclose state enacting laws advance goal worker safety restrict ways state wishes regulate issue worker safety federal standard effect option obtain prior approval secretary labor described act iii petitioner next argues even congress intended nonapproved state occupational safety health regulations whenever federal standard effect osh act effect extended state laws address public safety well occupational safety concerns explained part ii understand mean osh act state occupational safety health standards relating occupational safety health issue respect federal standard promulgated consider whether dual impact law occupational safety health standard subject act osh act defines occupational safety health standard standard requires conditions adoption use one practices means methods operations processes reasonably necessary appropriate provide safe healthful employment places employment state law requirement designed promote health safety workplace falls neatly within act definition occupational safety health standard clearly definition state law expressly declares legislative purpose regulating occupational health safety absence approved state plan osh standard regulating subject matter petitioner asserts state legislature articulates purpose addition workplace health safety osh act loses force disagree although part field defined reference purpose state law question another part field defined state law actual effect english general electric citing pacific gas elec state energy resources conservation development assessing impact state law federal scheme refused rely solely legislature professed purpose looked well effects law explained two decades ago longer adhere aberrational doctrine state law may frustrate operation federal law long state legislature passing law purpose mind one frustration apart fact odds approach taken nearly supremacy clause cases doctrine enable state legislatures nullify nearly unwanted federal legislation simply publishing legislative committee report articulating state interest policy frustration federal objective tangentially furthered proposed state law ny state legislation frustrates full effectiveness federal law rendered invalid supremacy clause perez campbell precedents leave doubt dual impact state regulation avoid osh act simply regulation serves several objectives rather one appeals observed defeat purpose section state enact measures stricter osha largely accomplished regulation worker health safety simply asserting purpose legislation whatever purpose purposes state law analysis ignore effect challenged state action field key question thus point state regulation sufficiently interferes federal regulation deemed act english general electric supra held state tort claim brought employee nuclear fuels production facility employer federal whistleblower provision state law direct substantial effect federal scheme decision appeals relied english hold absence approval secretary osh act state law constitutes direct clear substantial way regulation worker health safety agree appropriate standard determining osh act hand state laws general applicability laws regarding traffic safety fire safety conflict osha standards regulate conduct workers nonworkers alike generally although laws general applicability may direct substantial effect worker safety fairly characterized occupational standards regulate workers simply members general public case agree law directed workplace safety saved simply state demonstrate additional effect outside workplace sum state law requirement directly substantially specifically regulates occupational safety health occupational safety health standard within meaning act law may also nonoccupational impact render less occupational standard purposes analysis state wishes enact dual impact law regulates occupational safety health issue federal standard effect act requires state submit plan approval secretary iv recognize compelling interest practice professions within boundaries part power protect public health safety valid interests broad power establish standards licensing practitioners regulating practice professions goldfarb virginia state bar see also ferguson skrupa dent west virginia supremacy clause doctrine derived state law however clearly within state acknowledged power interferes contrary federal law must yield felder casey quoting free bland see also de canas bica even state regulation designed protect vital state interests must give way paramount federal legislation therefore reject petitioner argument state interest licensing various occupations save osh act provisions directly substantially affect workplace safety also reject petitioner argument illinois licensing acts regulate occupational safety health instead precondition employment reasoning osha regulations considered occupational standards sara however makes clear training employees engaged hazardous waste operations occupational safety health issue see supra certification requirements employee may engage work occupational safety health standards see ibid neither osh act saving provisions implicated illinois approved state plan state licensing acts osh act extent establish occupational safety health standards training work hazardous wastes like appeals specifically consider licensing acts provisions stand fall analysis set forth judgment appeals hereby affirmed footnotes justice kennedy agreeing scope osh act finds express rather implied post kennedy concurring part concurring judgment previous observation categories rigidly distinct english general electric proved true case persuaded text act provides strongest indication congress intended promulgation federal safety health standard nonapproved state regulation issue say rises level express end even justice kennedy finds express relying negative inference governs state law federal law post agree negative implications text although ultimately dispositive analysis expressly address issue federal state law therefore prefer place case category implied supra although chosen use term conflict easily stated promulgation federal safety health standard field nonapproved state law regulating safety health issue see english supra ield may understood species conflict state law falls within field conflicts congress intent either express plainly implied exclude state regulation post souter dissenting frequently label choose carry substantive implications scope case however disagreement justice kennedy whether osh act effect labeled express implied less important agreement implications text statute evince congressional intent nonapproved state regulations federal standard effect justice kennedy concurring part concurring judgment though concur judgment ultimate conclusion state law find express terms federal statute agree denominate case one implied contrary view plurality based undue expansion implied jurisprudence view neither wise necessary majority dissent acknowledge identified three circumstances federal statute state law first congress adopt express language defining existence scope second state law congress creates scheme federal regulation pervasive leave room supplementary state regulation third state law extent actually conflicts federal law english general electric ante post third form actual conflict occurs either impossible private party comply state federal requirements state law stands obstacle accomplishment execution full purposes objectives congress english supra quoting hines davidowitz plurality hold today state occupational safety health standards regulating issue federal standard exists conflict congress purpose subject employers employees one set regulations ante application standards conclusory statement assumes congress intended exclusive federal jurisdiction see mode analysis advances consideration case decisions establish high threshold must met state law conflicting purposes federal act conflict must irreconcilable existence hypothetical potential conflict insufficient warrant state statute rice norman williams see also english supra teaching decisions enjoin seeking conflicts state federal regulation none clearly exists quoting huron portland cement detroit pacific gas elec state energy resources conservation development view type limited state laws impose prohibitions obligations direct contradiction congress primary objectives conveyed clarity federal legislation believe supplementary state regulation occupational safety health issue said create sort actual conflict required decisions purpose state supplementary regulation like federal standards promulgated occupational safety health administration osha protect worker safety health potential tension scheme federal regulation workplace concurrent supplementary state scheme view rise level actual conflict described cases absent express provisions occupational safety health act osh act say state supplementary regulation conflicts purposes osh act interferes methods federal statute designed reach goal ante quoting international paper ouellette plurality broad view actual conflict contrary two basic principles jurisprudence first begin assumption historic police powers superseded unless clear manifest purpose congress rice santa fe elevator see also ante second purpose congress ultimate touchstone cases malone white motor quoting retail clerks schermerhorn freewheeling judicial inquiry whether state statute tension federal objectives undercut principle congress rather courts state law nonetheless agree osh act state occupational safety health standards relating occupational safety health issue respect federal standard promulgated ante quoting believe however result mandated express terms osh act follows scope act also limited language statute existence evident statutory text inquiry must begin end statutory framework finding express case contrary longstanding rule infer historic police powers absent clear statement intent congress rice santa fe elevator supra jones rath packing english though statutes creating express contain explicit statement effect statement admittedly lacking never required particular magic words express cases task cases enforce clear manifest purpose congress rice santa fe elevator supra held express cases congress intent must divined language structure purposes statute whole mcclendon pilot life ins dedeaux language osh statute sets forth scheme light provisions must interpreted express displaces state law follows plurality analysis amply demonstrates ante congress addressed issue osh act dissent position act supplementary state regulation becomes implausible language considered conjunction provisions section provides follows state desires assume responsibility development enforcement therein occupational safety health standards relating occupational safety health issue respect federal standard promulgated shall submit state plan emphasis added regard disagree dissent see post find unconvincing conclusion congress intended allow concurrent state federal jurisdiction occupational safety health issues dissent give rather federal government power decide whether particular occupational safety health issue exist single dual regulatory scheme theory state may choose exclusive federal jurisdiction regulating exclusive state jurisdiction submitting state plan dual regulation adopting supplementary rules illinois position undermines authority osha many respects example osh act allows osha disapprove state plans unduly burden interstate commerce dissent eviscerate important administrative mechanism allowing sidestep osha authority mechanism supplementary regulation see post furthermore concurrent state federal jurisdiction might interfere enforcement federal regulations without creating situation compliance schemes physical impossibility dissent require post see also brief respondent attribute congress intent create scheme authority views regard confirmed fact osha consistent matter since enactment osh act viewed providing exclusive jurisdiction areas issues standard cfr brief amicus curiae therefore dissent may correct theoretical matter separate provisions may reconciled allowing concurrent jurisdiction neither natural sound reading statutory scheme necessary implication finding express case scope osh act defined language provision requires federal approval state occupational safety health standards alone state laws fitting within description reason agree state laws general applicability ante also agree state law requirement directly substantially specifically regulates occupational safety health occupational safety health standard within meaning act therefore falls within scope dual impact state regulations meet standard osh act regardless additional purpose law may serve effect law may outside workplace final matter agree illinois acts saved operate licensing mechanism rather direct regulation workplace therefore join part ii opinion concur judgment justice souter justice blackmun justice stevens justice thomas join dissenting holds today occupational safety health act act state regulation occupational safety health issue federal standard whether state regulation conflicts federal standard sense enforcement one preclude application respect dissent light rule federal state law found clear congressional purpose supplant exercises traditional police powers text act fails support conclusion cases recognize federal state law three variants express field conflict express requires explicit language see pacific gas elec state energy resources conservation development citing jones rath packing field wrought manifestation congressional intent occupy entire field even without federal rule particular matter within field state regulation matter leaving untouched either state federal law finally conflict either two senses first found compliance state federal law impossible second state law stands obstacle accomplishment execution full purposes objectives congress hines davidowitz plurality today finds last sort discerning conflict state legislation given issue federal standard effect congressional purpose subject employers employees one set regulations ante thus plurality reading regulation issue federal standard promulgated one commentator observed kind occurs state law held undermin congressional decision favor national uniformity standards presents situation similar practical effect federal occupation field tribe american constitutional law ed still whether issue described occupation narrow field federal standard promulgated regulations conflict federal objective single regulation justice kennedy describes express see ante opinion concurring part concurring judgment key congressional intent find language statute insufficient demonstrate intent state law way ii analysis begins presumption congress intend displace state law maryland louisiana field congress said traditionally occupied see art patapsco guano north carolina start assumption historic police powers superseded federal act unless clear manifest purpose congress rice santa fe elevator assumption provides assurance balance bass disturbed unintentionally congress unnecessarily courts congress unmistakably ordained florida lime avocado growers paul enactments alone regulate part commerce state laws regulating aspect commerce must fall jones supra subject principle enquiry possibly effect federal legislation exercise statutory construction statute terms read sensibly effect presumption controls may inferred iii first blush respondent strongest argument might seem rest act full text assertion state standards absence applicable federal standards nothing chapter shall prevent state agency asserting jurisdiction state law occupational safety health issue respect standard effect section title plurality errs doubly first premise incorrect sense plurality uses term possibility conflict even absent federal regulation since mere enactment federal law like act may amount occupation entire field preventing state regulation second necessary implication every federal regulation state law issue question federal regulations may state law plurality ignores possibility provision simply rules field otherwise entirely compatible possibility occur actual conflict federal regulation state rule renders compliance impossible indeed congress meant say state rule deals issue federal regulation effect text subsection inept way trying make point however inept way make different point congress intended field sphere health safety subject regulation necessarily regulated act unlike case field occurs provision tells us absence federal standard leaves state free issue beyond subsection necessarily mean anything provision perfectly consistent conclusion long compliance federal standard state regulation physically impossible see florida lime avocado growers paul standard shall enforceable indeed presumption means anything must read way respondent also relies submission state plan development enforcement state standards applicable federal standards state time desires assume responsibility development enforcement therein occupational safety health standards relating occupational safety health issue respect federal standard promulgated section title shall submit state development standards enforcement plurality justice kennedy acknowledge however necessary implication see ante plurality opinion ante opinion concurring part concurring judgment subsection simply say unless plan approved state law issue promulgation federal standard fact tugs way actually providing mechanism state assume responsibility issue respect federal standard promulgated federal law far anything adopted heading enacted part statute properly considered canons construction whatever light may shed see strathearn dillon ftc mandel brothers speaks expressly development enforcement state standards applicable federal standards provision way provide absent state federal rules state may even supplement federal standards consistent regulations nothing provision language speaks one way question whether promulgation federal standard state regulation whether absence plan consistent federal state regulations may coexist provision thus makes perfect sense assumption dual regulatory scheme permissible subject state state wishes shoulder enough federal mandate gain approval plan provision setting conditions secretary approval plan indicate state regulation issue federally addressed never enforceable unless incorporated plan approved subsection requires secretary approve plan judgment among things unduly burden interstate commerce respondent argues plurality concludes state regulations provision somehow suggest acting independently enforce regulations burden interstate commerce unduly brief respondent see ante simply follow subsection puts limit secretary authority approve plan burdens interstate commerce thus capping discretion might otherwise read congressional delegation authority secretary approve state plans restriction applying secretary federal authority clearly non sequitur conclude must intended avoid equally objectionable undue burden independent state regulation might otherwise impose quite contrary dormant commerce clause take care without need assume final provision arguably suggests merely promulgation federal standard temporary enforcement state standards secretary may enter agreement state state permitted continue enforce one occupational health safety standards effect state final action taken secretary respect plan submitted state subsection section two years december whichever earlier however necessary implication text purely permissive provision enforcement state regulations imply state regulations otherwise unenforceable necessarily means secretary agree permit state limited time enforce whatever state regulations otherwise true actually conflicted federal standard employer comply still comply federal law well thus case state wishing submit plan provision read allowed possibility one transition state law state plan read reads however employers employees state subjected first state law given issue promulgation federal standard standard approval plan new state regime one enforced readjustment better two statute better read accordingly iv sum rule traditional police powers state survive unless congress made purpose clear see rice act many words state regulation issues federal standards promulgated respondent contention oral argument reading subsections leave logical conclusion one wrong provision read consistently others without implication intent see national solid wastes management assn killian easterbrook dubitante fact consistent purpose objective permit overlapping state federal regulation one guarantee employers employees subjected one regulatory regime restriction one regime precluding supplemental state regulation might might desirable absence clear expression congressional intent conclude long compliance federally promulgated standards render obedience illinois regulations impossible enforcement state law prohibited supremacy clause respectfully dissent plurality also relies deals withdrawal approval state plan see ante section provides state may retain jurisdiction case commenced withdrawal plan order enforce standards plan whenever issues involved relate reasons withdrawal plan plurality mistaken concluding assumes state loses power enforce occupational safety health standards approval withdrawn ibid assumes state loses capacity enforce plan except pending cases says nothing state law may remain books exclusive plan authority new law enacted withdrawal secretary approval