jones argued november decided january government obtained search warrant permitting install gps tracking device vehicle registered respondent jones wife warrant authorized installation district columbia within days agents installed device day maryland government tracked vehicle movements days subsequently secured indictment jones others drug trafficking conspiracy charges district suppressed gps data obtained vehicle parked jones residence held remaining data admissible jones reasonable expectation privacy vehicle public streets jones convicted circuit reversed concluding admission evidence obtained warrantless use gps device violated fourth amendment held government attachment gps device vehicle use device monitor vehicle movements constitutes search fourth amendment pp fourth amendment protects right people secure persons houses papers effects unreasonable searches seizures government physical intrusion effect purpose obtaining information constitutes search type encroachment area enumerated amendment considered search within meaning amendment time adopted pp conclusion consistent fourth amendment jurisprudence latter half century tied trespass later cases deviated exclusively approach applied analysis justice harlan concurrence katz said fourth amendment protects person reasonable expectation privacy need address government contention jones reasonable expectation privacy jones fourth amendment rights rise fall katz formulation bottom must assur preservation degree privacy government existed fourth amendment adopted kyllo katz repudiate understanding fourth amendment embodies particular concern government trespass upon areas enumerates katz test added substituted trespassory test see alderman soldal cook county knotts karo cases rejecting fourth amendment challenges beepers electronic tracking devices representing another form electronic monitoring foreclose conclusion search occurred new york class oliver also support government position pp government alternative argument attachment use device search reasonable one forfeited raised affirmed scalia delivered opinion roberts kennedy thomas sotomayor joined sotomayor filed concurring opinion alito filed opinion concurring judgment ginsburg breyer kagan joined opinion notice opinion subject formal revision publication preliminary print reports readers requested notify reporter decisions washington typographical formal errors order corrections may made preliminary print goes press petitioner antoine jones writ certiorari appeals district columbia circuit january justice scalia delivered opinion decide whether attachment gps tracking device individual vehicle subsequent use device monitor vehicle movements public streets constitutes search seizure within meaning fourth amendment respondent antoine jones owner operator nightclub district columbia came suspicion trafficking narcotics made target investigation joint fbi metropolitan police department task force officers employed various investigative techniques including visual surveillance nightclub installation camera focused front door club pen register wiretap covering jones cellular phone based part information gathered sources government applied district district columbia warrant authorizing use electronic tracking device jeep grand cherokee registered jones wife warrant issued authorizing installation device district columbia within days day district columbia agents installed gps tracking device undercarriage jeep parked public parking lot next days government used device track vehicle movements replace device battery vehicle parked different public lot maryland means signals multiple satellites device established vehicle location within feet communicated location cellular phone government computer relayed pages data period government ultimately obtained indictment charging jones several alleged relevant conspiracy distribute possess intent distribute five kilograms cocaine grams cocaine base violation trial jones filed motion suppress evidence obtained gps device district granted motion part suppressing data obtained vehicle parked garage adjoining jones residence supp held remaining data admissible person traveling automobile public thoroughfares reasonable expectation privacy movements one place another ibid quoting knotts jones trial october produced hung jury conspiracy count march grand jury returned another indictment charging jones others conspiracy government introduced trial locational data admitted first trial connected jones alleged conspirators stash house contained cash kilograms cocaine kilogram cocaine base jury returned guilty verdict district sentenced jones life imprisonment appeals district columbia circuit reversed conviction admission evidence obtained warrantless use gps device said violated fourth amendment maynard circuit denied government petition rehearing en banc four judges dissenting granted certiorari ii fourth amendment provides relevant part right people secure persons houses papers effects unreasonable searches seizures shall violated beyond dispute vehicle effect term used amendment chadwick hold government installation gps device target use device monitor vehicle movements constitutes search important clear occurred case government physically occupied private property purpose obtaining information doubt physical intrusion considered search within meaning fourth amendment adopted entick carrington eng case described english freedom familiar american statesman time constitution adopted considered true ultimate expression constitutional regard search seizure brower county inyo quoting boyd case lord camden expressed plain terms significance property rights analysis ur law holds property every man sacred man set foot upon neighbour close without leave trespasser though damage tread upon neighbour ground must justify law entick supra text fourth amendment reflects close connection property since otherwise referred simply right people secure unreasonable searches seizures phrase persons houses papers effects superfluous consistent understanding fourth amendment jurisprudence tied trespass least latter half century kyllo kerr fourth amendment new technologies constitutional myths case caution rev thus olmstead held wiretaps attached telephone wires public streets constitute fourth amendment search entry houses offices defendants later cases course deviated exclusively approach katz said fourth amendment protects people places found violation attachment eavesdropping device public telephone booth later cases applied analysis justice harlan concurrence case said violation occurs government officers violate person reasonable expectation privacy see bond california ciraolo smith maryland government contends harlan standard shows search occurred since jones reasonable expectation privacy area jeep accessed government agents underbody locations jeep public roads visible need address government contentions jones fourth amendment rights rise fall katz formulation bottom must assur preservation degree privacy government existed fourth amendment adopted kyllo supra explained history fourth amendment understood embody particular concern government trespass upon areas persons houses papers effects katz repudiate understanding less two years later upheld defendants contention government introduce conversations people obtained warrantless placement electronic surveillance devices homes opinion rejected dissent contention fourth amendment violation unless conversational privacy homeowner invaded alderman believe katz holding fourth amendment protects persons private conversations intended withdraw protection amendment extends home recently soldal cook county unanimously rejected argument although seizure occurred sense trailer home forcibly removed fourth amendment violation occurred law enforcement invade individuals privacy katz explained established property rights sole measure fourth amendment violations snuf previously recognized protection property justice brennan explained concurrence knotts katz erode principle government engage physical intrusion constitutionally protected area order obtain information intrusion may constitute violation fourth amendment opinion concurring judgment embodied preservation past rights definition reasonable expectation privacy said expectation source outside fourth amendment either reference concepts real personal property law understandings recognized permitted society minnesota carter internal quotation marks omitted katz narrow fourth amendment government contends several cases foreclose conclusion occurred constituted search relies principally two cases rejected fourth amendment challenges beepers electronic tracking devices represent another form electronic monitoring first case knotts upheld fourth amendment challenge use beeper placed container chloroform allowing law enforcement monitor location container said infringement knotts reasonable expectation privacy since information obtained location automobile carrying container public roads location container open fields near knotts cabin voluntarily conveyed discussed katz test added substituted trespassory test holding knotts addressed former since latter issue beeper placed container came knotts possession consent knotts challenge installation specifically declined consider effect fourth amendment analysis knotts relevant perhaps government making argument otherwise unconstitutional search produces public information government make argument know case support second beeper case karo suggest different conclusion addressed question left open knotts whether installation beeper container amounted search seizure knotts time beeper installed container belonged third party come possession defendant later thus specific question considered whether installation consent original owner constitute search seizure container delivered buyer knowledge presence beeper emphasis added held government said came physical contact container belonged defendant karo transfer container unmonitored beeper inside convey information thus invade karo privacy see conclusion perfectly consistent one reach karo accepted container came beeper therefore entitled object beeper presence even though used monitor container location cf lee search seizure informant wearing concealed microphone invited defendant business jones possessed jeep time government trespassorily inserted device much different footing government also points exposition new york class exterior car thrust public eye thus examine constitute statement marginal relevance since government acknowledges officers case conduct visual inspection respondent vehicle brief emphasis added attaching device jeep officers encroached protected area class suggested make difference concluded officer momentary reaching interior vehicle constitute finally government position gains little support conclusion oliver officers intrusion open field constitute fourth amendment search even though trespass common law quite simply open field unlike curtilage home see dunn one protected areas enumerated fourth amendment oliver supra see also hester government physical intrusion area unlike intrusion effect issue fourth amendment concurrence begins accusing us applying tort law post distortion apply guarantee unreasonable searches believe must provide minimum degree protection afforded adopted concurrence share belief apply exclusively katz test even eliminates rights previously existed concurrence faults approach present ing particularly vexing problems cases involve physical contact involve transmission electronic signals post entirely fail understand point unlike concurrence make katz exclusive test make trespass exclusive test situations involving merely transmission electronic signals without trespass remain subject katz analysis fact concurrence insistence exclusivity katz test needlessly leads us particularly vexing problems present case date deviated understanding mere visual observation constitute search see kyllo accordingly held knotts person traveling automobile public thoroughfares reasonable expectation privacy movements one place another thus even assuming concurrence correct say raditional surveillance jones period required large team agents multiple vehicles perhaps aerial assistance post cases suggest visual observation constitutionally permissible may achieving result electronic means without accompanying trespass unconstitutional invasion privacy present case require us answer question answering affirmatively leads us needlessly additional thorny problems concurrence posits relatively monitoring person movements public streets okay use longer term gps monitoring investigations offenses good post emphasis added introduces yet another novelty jurisprudence precedent proposition whether search occurred depends nature crime investigated even accepting novelty remains unexplained investigation surely long conspiracy involving substantial amounts cash narcotics extraordinary offens may permit longer observation see post monitoring suspected purveyor stolen electronics monitoring suspected terrorist may grapple vexing problems future case classic trespassory search involved resort must katz analysis reason rushing forward resolve iii government argues alternative even attachment use device search reasonable thus lawful fourth amendment officers reasonable suspicion indeed probable cause believe jones leader cocaine distribution conspiracy brief occasion consider argument government raise circuit therefore address see ginsburg tatel griffith concurring denial rehearing en banc consider argument forfeited see sprietsma mercury marine judgment appeals circuit affirmed ordered sotomayor concurring petitioner antoine jones writ certiorari appeals district columbia circuit january justice sotomayor concurring join opinion agree search within meaning fourth amendment occurs minimum government obtains information physically intruding constitutionally protected area ante case government installed global positioning system gps tracking device respondent antoine jones jeep without valid warrant without jones consent used device monitor jeep movements course four weeks government usurped jones property purpose conducting surveillance thereby invading privacy interests long afforded undoubtedly entitled fourth amendment protection see silverman course fourth amendment concerned trespassory intrusions property see kyllo rather even absence trespass fourth amendment search occurs government violates subjective expectation privacy society recognizes reasonable see also smith maryland katz harlan concurring katz enlarged focus property rights announcing reach fourth amendment turn upon presence absence physical intrusion majority opinion makes clear however katz test augmented displace diminish trespassory test preceded ante thus government engage physical intrusion constitutionally protected area order obtain information intrusion may constitute violation fourth amendment knotts brennan concurring judgment see also rakas illinois justice alito approach discounts altogether constitutional relevance government physical intrusion jones jeep erodes longstanding protection privacy expectations inherent items property people possess control see post opinion concurring judgment contrast trespassory test applied majority opinion reflects irreducible constitutional minimum government physically invades personal property gather information search occurs reaffirmation principle suffices decide case nonetheless justice alito notes physical intrusion unnecessary many forms surveillance post increasing regularity government capable duplicating monitoring undertaken case enlisting vehicle tracking devices smartphones see kozinski dissenting denial rehearing en banc cases electronic novel modes surveillance depend upon physical invasion property majority opinion trespassory test may provide little guidance ituations involving merely transmission electronic signals without trespass remain subject katz analysis ante justice alito incisively observes technological advances made possible nontrespassory surveillance techniques also affect katz test shaping evolution societal privacy expectations post rubric agree justice alito least longer term gps monitoring investigations offenses impinges expectations privacy post cases involving even monitoring unique attributes gps surveillance relevant katz analysis require particular attention gps monitoring generates precise comprehensive record person public movements reflects wealth detail familial political professional religious sexual associations see people weaver disclosed gps data trips indisputably private nature takes little imagination conjure trips psychiatrist plastic surgeon abortion clinic aids treatment center strip club criminal defense attorney motel union meeting mosque synagogue church gay bar government store records efficiently mine information years future opinion kozinski gps monitoring cheap comparison conventional surveillance techniques design proceeds surreptitiously evades ordinary checks constrain abusive law enforcement practices limited police resources community hostility illinois lidster awareness government may watching chills associational expressive freedoms government unrestrained power assemble data reveal private aspects identity susceptible abuse net result gps monitoring making available relatively low cost substantial quantum intimate information person government unfettered discretion chooses track may alter relationship citizen government way inimical democratic society flaum concurring take attributes gps monitoring account considering existence reasonable societal expectation privacy sum one public movements ask whether people reasonably expect movements recorded aggregated manner enables government ascertain less political religious beliefs sexual habits regard dispositive fact government might obtain fruits gps monitoring lawful conventional surveillance techniques see kyllo ante leaving open possibility duplicating traditional surveillance electronic means without accompanying trespass unconstitutional invasion privacy also consider appropriateness entrusting executive absence oversight coordinate branch tool amenable misuse especially light fourth amendment goal curb arbitrary exercises police power prevent permeating police surveillance di fundamentally may necessary reconsider premise individual reasonable expectation privacy information voluntarily disclosed third parties smith miller approach ill suited digital age people reveal great deal information third parties course carrying mundane tasks people disclose phone numbers dial text cellular providers urls visit addresses correspond internet service providers books groceries medications purchase online retailers perhaps justice alito notes people may find tradeoff privacy convenience worthwhile come accept diminution privacy inevitable post perhaps one doubt people accept without complaint warrantless disclosure government list every web site visited last week month year whatever societal expectations attain constitutionally protected status fourth amendment jurisprudence ceases treat secrecy prerequisite privacy assume information voluntarily disclosed member public limited purpose reason alone disentitled fourth amendment protection see smith marshall dissenting privacy discrete commodity possessed absolutely disclose certain facts bank phone company limited business purpose need assume information released persons purposes see also katz hat person seeks preserve private even area accessible public may constitutionally protected resolution difficult questions case unnecessary however government physical intrusion jones jeep supplies narrower basis decision therefore join majority opinion alito concurring judgment petitioner antoine jones writ certiorari appeals district columbia circuit january justice alito justice ginsburg justice breyer justice kagan join concurring judgment case requires us apply fourth amendment prohibition unreasonable searches seizures surveillance technique use global system gps device monitor vehicle extended period time ironically chosen decide case based tort law attaching small gps underside vehicle respondent drove law enforcement officers case engaged conduct might provided grounds suit trespass reason concludes installation use gps device constituted search ante holding judgment unwise strains language fourth amendment little support current fourth amendment case law highly artificial analyze question presented case asking whether respondent reasonable expectations privacy violated monitoring movements vehicle drove fourth amendment prohibits unreasonable searches seizures makes little effort explain attachment use gps device fits within terms contend seizure seizure property occurs meaningful interference possessory interests property jacobsen none indeed success surveillance technique officers employed dependent fact gps interfere way operation vehicle interference detected device might discovered claim installation use gps constituted search see ante dependent questionable proposition two procedures separated purposes fourth amendment analysis two procedures analyzed separately clear opinion either regarded search clear attachment gps device search device functioned officers used information obtained contend use device constituted search either contrary accepts holding knotts use surreptitiously planted electronic device monitor vehicle movements public roads amount search see ante argues agree must preservation degree privacy government existed fourth amendment adopted ante quoting kyllo almost impossible think situations analogous took place case possible imagine case constable secreted somewhere coach remained period time order monitor movements coach owner theory seems concept search originally comprehended technical trespass led gathering evidence know common law unauthorized intrusion private property actionable see prosser keeton trespass open fields opposed curtilage home fall within scope fourth amendment private property outside curtilage part hous within meaning fourth amendment see oliver hester reasoning case similar early decisions involving wiretapping electronic eavesdropping namely technical trespass followed gathering evidence constitutes search early electronic surveillance cases concluded fourth amendment search occurred private conversations monitored result unauthorized physical penetration premises occupied defendant silverman silverman police officers listened conversations attached home inserting spike mike wall house shared vacant house next door procedure held search mike made contact heating duct side wall thus usurp ed integral part premises contrast cases trespass held search thus olmstead found fourth amendment apply taps house lines made streets near houses similarly concluded search occurred goldman detectaphone placed outer wall defendant office purpose overhearing conversations held within room rule repeatedly criticized olmstead justice brandeis wrote immaterial physical connection telephone wires made dissenting opinion private conversation transmitted wire fall within literal words fourth amendment argued amendment understood prohibiting every unjustifiable intrusion government upon privacy individual see also silverman supra douglas concurring concept unauthorized physical penetration premises present decision rests seems beside point wrong done intimacies home tapped recorded revealed depth penetration electronic device even degree remoteness inside house measure injury goldman supra murphy dissenting search one home office longer requires physical entry science brought forth far effective devices invasion person privacy direct obvious methods oppression detested forebears inspired fourth amendment katz finally away old approach holding trespass required fourth amendment violation katz use listening device attached outside public telephone booth allowed police officers eavesdrop one end target phone conversation procedure physically intrude area occupied target katz repudiate ed old doctrine rakas illinois held fact electronic device employed happen penetrate wall booth constitutional significance reach th fourth amendment turn upon presence absence physical intrusion given enclosure see rakas supra describing katz holding claim protection fourth amendment depends upon property right invaded place upon whether person claims protection amendment legitimate expectation privacy invaded place kyllo supra since decoupled violation person fourth amendment rights trespassory violation property mattered held whether conduct issue violated privacy upon defendant justifiably relied using telephone booth katz supra approach later put addressing relevance technical trespass actual trespass neither necessary sufficient establish constitutional violation karo emphasis added ibid compar ing katz trespass fourth amendment violation oliver trespass fourth amendment violation oliver wrote existence property right one element determining whether expectations privacy legitimate premise property interests control right government search seize discredited katz quoting warden hayden internal quotation marks omitted ii majority suggests two decisions soldal cook county alderman show technical trespass sufficient establish existence search provide little support soldal held towing away trailer home without owner consent constituted seizure even invade occupants personal privacy present case find seizure clear none occurred alderman held fourth amendment rights homeowners implicated use surreptitiously planted listening device monitor conversations occurred within home see alderman best understood mean homeowners legitimate expectation privacy conversations took place roof see rakas citing alderman proposition altogether abandoned use property concepts determining presence absence privacy interests protected amendment powell concurring citing alderman proposition property rights reflect society explicit recognition person act wishes certain areas therefore considered determining whether individual expectations privacy reasonable karo supra stevens concurring part dissenting part citing alderman support proposition homeowner reasonable expectation privacy contents home including items owned others sum majority hard pressed find support cases theory iii disharmony substantial body existing case law one problems approach case briefly note four others first reasoning largely disregards really important use gps purpose tracking instead attaches great significance something view relatively minor attaching bottom car small light object interfere way car operation attaching object generally regarded trivial provide basis recovery modern tort law see prosser keeton harmless trivial contact personal property actionable dobbs law torts reasoning conduct may violate fourth amendment contrast monitoring accomplished without committing technical trespass suppose example federal government required persuaded auto manufacturers include gps tracking device every car theory provide protection second approach leads incongruous results police attach gps device car use device follow car even brief time theory fourth amendment applies police follow car much longer period using unmarked cars aerial assistance tracking subject fourth amendment constraints present case fourth amendment applies concludes officers installed gps device respondent wife car registered turned respondent exclusive use see ante gps attached prior time theory lead different result proceeds assumption respondent least property rights bailee ante bailee may sue trespass chattel injury occurs term bailment see jur bailment pp gps device installed respondent wife gave keys respondent claim trespass presumably fourth amendment claim either third theory coverage fourth amendment may vary state state events issue occurred community property state adopted uniform marital property respondent likely owner vehicle matter whether gps installed wife turned keys hand registration vehicle name respondent wife generally regarded presumptive evidence sole owner see motor vehicles pp jur automobiles pp fourth reliance law trespass present particularly vexing problems cases involving surveillance carried making electronic opposed physical contact item tracked example suppose officers present case followed respondent surreptitiously activating stolen vehicle detection system came car purchased sending radio signal activate system constitute trespass chattels trespass chattels traditionally required physical touching property see restatement second torts comment dobbs supra recent years courts wrestled application old tort cases involving unwanted electronic contact computer systems held even transmission electrons occurs communication sent one computer another enough see compuserve cyber promotions supp sd ohio bezenek cal app may decisions followed applying trespass theory assuming matters theory law trespass existed time adoption fourth amendment recent decisions represent change law simply application old tort new situations iv katz test avoids problems complications noted without difficulties involves degree circularity see kyllo judges apt confuse expectations privacy hypothetical reasonable person katz test looks see minnesota carter scalia concurring addition katz test rests assumption hypothetical reasonable person stable set privacy expectations technology change expectations dramatic technological change may lead periods popular expectations flux may ultimately produce significant changes popular attitudes new technology may provide increased convenience security expense privacy many people may find tradeoff worthwhile even public welcome diminution privacy new technology entails may eventually reconcile development hand concern new intrusions privacy may spur enactment legislation protect intrusions ultimately happened respect wiretapping katz congress leave courts develop body fourth amendment case law governing complex subject instead congress promptly enacted comprehensive statute see ed supp iv since time regulation wiretapping governed primarily statute case ironic sense although katz overruled olmstead chief justice taft suggestion latter case regulation wiretapping matter better left congress see borne recent years seen emergence many new devices permit monitoring person movements locales television video monitoring becoming ubiquitous toll roads automatic toll collection systems create precise record movements motorists choose make use convenience many motorists purchase cars equipped devices permit central station ascertain car location time roadside assistance may provided needed car may found stolen perhaps significant cell phones wireless devices permit wireless carriers track record location users june reported million wireless devices use older phones accuracy location information depends tower network new smart phones equipped gps device permit precise tracking example user activates gps phone provider able monitor phone location speed movement report back traffic conditions combining crowdsourcing speed phones particular similarly services offered social tools allowing consumers find avoid others enroll services availability use new devices continue shape average person expectations privacy daily movements age greatest protections privacy neither constitutional statutory practical traditional surveillance extended period time difficult costly therefore rarely undertaken surveillance issue case constant monitoring location vehicle four weeks required large team agents multiple vehicles perhaps aerial investigation unusual importance justified expenditure law enforcement resources devices like one used present case however make monitoring relatively easy cheap circumstances involving dramatic technological change best solution privacy concerns may legislative see kerr legislative body well situated gauge changing public attitudes draw detailed lines balance privacy public safety comprehensive way date however congress enacted statutes regulating use gps tracking technology law enforcement purposes best case apply existing fourth amendment doctrine ask whether use gps tracking particular case involved degree intrusion reasonable person anticipated approach relatively monitoring person movements public streets accords expectations privacy society recognized reasonable see knotts use longer term gps monitoring investigations offenses impinges expectations privacy offenses society expectation law enforcement agents others indeed main simply secretly monitor catalogue every single movement individual car long period case four weeks law enforcement agents tracked every movement respondent made vehicle driving need identify precision point tracking vehicle became search line surely crossed mark cases may present difficult questions uncertainty exists respect whether certain period gps surveil lance long enough constitute fourth amendment search police may always seek also need consider whether prolonged gps monitoring context investigations involving extraordinary offenses similarly intrude constitutionally protected sphere privacy cases tracking might mounted using previously available techniques reasons conclude lengthy monitoring occurred case constituted search fourth amendment therefore agree majority decision appeals must affirmed footnotes litigation government conceded noncompliance warrant argued warrant required maynard cadc noted jeep registered jones wife government acknowledged however jones exclusive driver internal quotation marks omitted jones owner least property rights bailee appeals concluded vehicle registration affect ability make fourth amendment objection government challenged determination therefore consider fourth amendment significance jones status justice alito concurrence hereinafter concurrence doubts wisdom approach almost impossible think situations analogous took place case post opinion concurring judgment fact posits situation far afield constable concealing target coach order track movements ibid doubt information gained trespassory activity product unlawful search whether information consisted conversations occurring coach destinations coach traveled case quite irrelevant whether analog whatever new methods investigation may devised task minimum decide whether action question constituted search within original meaning fourth amendment government obtains information physically intruding constitutionally protected area search undoubtedly occurred thus concurrence attempt recast alderman meaning individuals legitimate expectation privacy conversations take place roof post foreclosed opinion took given homeowner conversational privacy violated concurrence notes explained actual trespass neither necessary sufficient establish constitutional violation post quoting karo undoubtedly true undoubtedly irrelevant karo considering whether seizure occurred concurrence explains seizure property occurs trespass meaningful interference individual possessory interests property post internal quotation marks omitted likewise search trespass alone qualify must conjoined present attempt find something obtain information related similarly irrelevant concurrence point analyzed separately neither installation device use constitute fourth amendment search see ibid course trespass houses effects katz invasion privacy alone search unless done obtain information obtaining information alone search unless achieved trespass invasion privacy knotts noted limited use government made signals particular beeper reserved question whether different constitutional principles may applicable law enforcement practices type gps tracking made possible ibid government also points cardwell lewis rejected claim inspection impounded vehicle tire tread collection paint scrapings exterior violated fourth amendment whether plurality said search occurred search reasonable unclear compare opinion blackmun fail comprehend expectation privacy infringed circumstances probable cause exists warrantless examination exterior car unreasonable thus theory fourth amendment concerned technical trespass led gathering evidence post alito concurring judgment emphasis added fourth amendment protects trespassory searches regard items persons houses papers effects enumerates trespass occurred oliver may properly understood search one constitutional sense footnotes knotts foreclose conclusion gps monitoring absence physical intrusion fourth amendment search majority opinion notes knotts reserved question whether constitutional principles may invasive law enforcement practices gps tracking see ante quoting karo addressed fourth amendment implications installation beeper container consent container original owner aware beeper used surveillance purposes owners cars smartphones contemplate devices used enable covert surveillance movements contrary subscribers one service greeted similar suggestion anger quain changes onstar privacy terms rile users times online http visited available clerk case file addition bugged container karo lacked close relationship target car shares owner bugged container karo stationary much government surveillance see car movements contrast owner movements footnotes although record reveal size weight device used case device use weighs two ounces size credit card tr oral arg common law suit trespass chattels maintained violation dignitary interest inviolability chattels today must actual damage chattel action maintained keeton dobbs keeton owen prosser keeton law torts ed hereinafter prosser keeton actual damage vehicle gps device attached suggests something like might occurred required either gigantic coach tiny constable mention constable incredible fortitude patience see cal family code ann west see uniform marital property act see npr end privacy http internet materials visited available clerk case file time magazine everything tracked get joel stein mar vol see kerr fourth amendment new technologies constitutional myths case caution rev hereinafter kerr see ctia consumer info wireless quick facts http see bright side sitting traffic crowdsourcing road congestion data google blog http even radio transmitter like used knotts karo surveillance exceptionally demanding beepers used cases merely emit ted periodic signals picked radio receiver knotts signal limited range lost police stay close enough indeed knotts officers lost signal beeper assistance monitoring device located helicopter approximate location signal picked one hour later case agents obtained warrant comply two warrant restrictions install gps device within period required terms warrant fed rule crim proc install gps device within district columbia required terms warrant rule courts government argue argued fourth amendment impose precise restrictions violation restrictions demand suppression evidence obtained using tracking device see gerber burke raised question us