United States v. Donnell Artis , 919 F.3d 1123 ( 2019 )


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  •                               FOR PUBLICATION                           FILED
    UNITED STATES COURT OF APPEALS                      MAR 27 2019
    MOLLY C. DWYER, CLERK
    U.S. COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    UNITED STATES OF AMERICA,                      No.   18-10246
    Plaintiff-Appellant,           D.C. No. 3:16-cr-00477-VC-1
    v.
    OPINION
    DONNELL ARTIS; CHANTA HOPKINS,
    AKA Askari Aquil Mohammed,
    Defendants-Appellees.
    Appeal from the United States District Court
    for the Northern District of California
    Vince Chhabria, District Judge, Presiding
    Argued and Submitted January 11, 2019
    Pasadena, California
    Before: A. Wallace Tashima and Paul J. Watford, Circuit Judges, and Eduardo C.
    Robreno,* District Judge.
    WATFORD, Circuit Judge:
    Federal agents may have violated California law when they executed two
    search warrants issued by state court judges. California law authorizes “peace
    officers” to execute search warrants, but excludes federal law enforcement officers
    *
    The Honorable Eduardo C. Robreno, United States District Judge for
    the Eastern District of Pennsylvania, sitting by designation.
    Page 2 of 22
    from the definition of that term. This apparent violation of state law, we conclude,
    does not render the warrants invalid under the Fourth Amendment. One of the
    warrants, however, was not supported by probable cause, and the evidence seized
    pursuant to that warrant must be suppressed.
    I
    At the time of the events relevant to this appeal, defendants Donnell Artis
    and Chanta Hopkins were alleged confederates engaged in credit card fraud and
    identity theft. Both were also fugitives from justice with outstanding warrants for
    their arrest on state law charges.
    Artis and Hopkins came to the attention of Stonie Carlson, a Special Agent
    with the Federal Bureau of Investigation assigned to the Pacific Southwest
    Regional Fugitive Task Force, a joint federal-state task force operating under the
    direction of the United States Marshals Service. See 34 U.S.C. § 41503(a). Agent
    Carlson set out to find the two men, both of whom were believed to be in or around
    Oakland, California. Officers from the Oakland Police Department informed
    Agent Carlson that Artis and Hopkins could often be found hanging out at a
    particular liquor store in Oakland, and Agent Carlson spotted Artis there one day.
    When Agent Carlson and his partner tried to arrest Artis, a brief scuffle ensued,
    during which Artis dropped his cell phone. Artis broke away and managed to
    escape on foot, leaving his cell phone behind. Agent Carlson returned to the liquor
    Page 3 of 22
    store and retrieved the phone, a seizure rendered lawful by Artis’ abandonment of
    the phone when he fled from agents attempting to arrest him.
    In his capacity as a member of the fugitive task force, Agent Carlson applied
    for a warrant to search Artis’ cell phone. Although he could have asked a federal
    magistrate judge to issue the warrant under Federal Rule of Criminal Procedure 41,
    Agent Carlson submitted the application to a judge of the Alameda County
    Superior Court. Agent Carlson later explained that he did so because Artis’
    outstanding arrest warrants were for state law offenses and at the time Agent
    Carlson was not contemplating filing federal charges against Artis. For reasons
    unexplained in the record, Agent Carlson did not predicate the warrant application
    on Artis’ status as a known fugitive, which would have provided a basis to search
    his phone for information useful in finding him. Instead, Agent Carlson’s affidavit
    recounted facts establishing probable cause to believe that Artis was engaged (with
    Hopkins) in a conspiracy to commit credit card fraud under state law. He
    requested permission to search Artis’ cell phone for evidence of that offense.
    The Alameda County Superior Court judge issued a warrant, directed to
    “any peace officer in Alameda County,” authorizing a search of Artis’ cell phone
    for “evidence of a crime”—in particular, for eight specified categories of
    information, such as stored email and text messages “[c]ontaining any references
    to fraud or related criminal activity.” Agent Carlson found that he lacked the
    Page 4 of 22
    technical expertise to execute the warrant himself, but after a few days’ delay he
    enlisted the help of a fellow FBI agent who was able to extract the relevant
    information from Artis’ phone. Based in part on that evidence, the government
    charged Artis with the federal firearms and identity-theft offenses he faces in this
    case.
    Two days after obtaining the warrant to search Artis’ phone, but before he
    had been able to execute it, Agent Carlson applied for a second search warrant, this
    one targeting Hopkins. Agent Carlson again applied for the warrant in his capacity
    as a member of the fugitive task force, and he again submitted the application to an
    Alameda County Superior Court judge rather than a federal magistrate judge.
    Agent Carlson predicated the Hopkins warrant application solely on Hopkins’
    status as a fugitive with an outstanding warrant for his arrest. The application
    sought authorization to use a cell-site simulator to track the location of a cell phone
    assigned the number (832) 763-5555. Agent Carlson’s affidavit recounted facts
    establishing probable cause to believe that Hopkins was then using the targeted cell
    phone.
    An Alameda County Superior Court judge issued a search warrant, also
    directed to “any peace officer in the County of Alameda,” authorizing use of a cell-
    site simulator for a period of 30 days to track the location of the targeted cell
    Page 5 of 22
    phone. The warrant stated that federal agents “employed by the United States
    Marshals Service are authorized to assist in the service of this search warrant.”
    A federal agent working as part of the fugitive task force deployed the cell-
    site simulator in accordance with the warrant. Through use of the device and
    additional investigative work, task force agents determined that Hopkins lived in a
    particular apartment building in San Francisco. They arrested him as he left the
    apartment and found incriminating evidence during a search incident to arrest.
    That evidence formed the basis for a search warrant issued by a San Francisco
    County Superior Court judge authorizing a search of Hopkins’ apartment. The
    apartment search yielded much of the evidence underlying the federal drug-
    trafficking and identity-theft charges filed against Hopkins in this case.
    Artis and Hopkins filed separate motions to suppress that challenged the
    validity of their respective Alameda County Superior Court search warrants. Both
    motions argued that: (1) the warrants were invalid because they were executed by
    officials not authorized to execute warrants under California law; and (2) the
    warrants were not supported by probable cause.
    After conducting an evidentiary hearing at which Agent Carlson testified,
    the district court granted both motions to suppress. The court agreed with the
    defendants that “under California law, federal law enforcement officers are not
    permitted to execute search warrants issued by California state judges.” United
    Page 6 of 22
    States v. Artis, 
    315 F. Supp. 3d 1142
    , 1145 (N.D. Cal. 2018). The court concluded
    that federal agents impermissibly executed both warrants but recognized that
    suppression would not be justified on the basis of this state law violation alone. 
    Id. at 1143–44.
    In addition, though, the court held that neither warrant was supported
    by probable cause, and it declined to apply the good-faith exception to the
    exclusionary rule in view of a “string of errors” embodied in the two warrant
    applications submitted by Agent Carlson.
    As permitted under 18 U.S.C. § 3731, the government filed an interlocutory
    appeal from the district court’s suppression ruling.
    II
    The outcome of this appeal turns on whether the challenged searches
    violated the Fourth Amendment, which protects the people’s right “to be secure in
    their persons, houses, papers, and effects, against unreasonable searches and
    seizures.” Certain searches must be conducted pursuant to a warrant to be deemed
    reasonable. The search of Artis’ cell phone definitely required a warrant, see Riley
    v. California, 
    573 U.S. 373
    (2014), and we will assume (as the government has)
    that use of a cell-site simulator to track the location of Hopkins’ cell phone also
    required a warrant. But both of the searches in question were conducted pursuant
    to a warrant. To establish a Fourth Amendment violation, then, the defendants
    must succeed in showing either that the warrants were invalid under the Fourth
    Page 7 of 22
    Amendment or that, even if valid, the warrants were executed in a manner that
    rendered the searches unreasonable.
    The defendants have confined themselves to the first line of argument,
    framing their challenge solely as an attack on the validity of their respective
    warrants. They do not contend that anything about the manner of execution
    rendered the searches unreasonable. They have not asserted, for example, that the
    scope of the searches conducted by the agents exceeded what the warrants
    authorized, or that the agents seized evidence not described in the warrants. Their
    only complaint about the manner in which the warrants were executed is that
    federal agents conducted the searches instead of officials designated as “peace
    officers” under state law. But the identity of the executing officers—federal agents
    versus peace officers—does not implicate any interest protected by the Fourth
    Amendment. No greater intrusion upon protected privacy or property interests
    occurred by virtue of the fact that the searches were conducted by federal agents as
    opposed to, say, city police officers. Cf. Wilson v. Layne, 
    526 U.S. 603
    , 614
    (1999) (holding that police violated the Fourth Amendment by allowing members
    of the news media into a home during the execution of a warrant, due to the
    heightened intrusion upon privacy interests caused by their unauthorized presence
    and non-law-enforcement purpose).
    Page 8 of 22
    To succeed here, the defendants must demonstrate that their respective
    search warrants were invalid under the Fourth Amendment. The Amendment’s
    Warrant Clause provides that a warrant may be issued only “upon probable cause,
    supported by Oath or affirmation, and particularly describing the place to be
    searched, and the persons or things to be seized.” The Supreme Court has held that
    this language imposes three requirements for issuance of a valid search warrant.
    First, the warrant must be issued by a neutral and detached magistrate. Dalia v.
    United States, 
    441 U.S. 238
    , 255 (1979).1 Second, the warrant must be supported
    by “probable cause to believe that the evidence sought will aid in a particular
    apprehension or conviction for a particular offense.” 
    Id. (internal quotation
    marks
    omitted). And third, the warrant must describe the things to be seized and the
    place to be searched with particularity. 
    Id. Only the
    second of these requirements—whether the warrants were
    supported by probable cause—is open to serious challenge. (We address that issue
    in the next section.) As to the first requirement, both warrants were issued by
    neutral and detached judges of the Alameda County Superior Court who were
    authorized to issue search warrants in the jurisdiction where the warrants were to
    1
    Our court has recently held that, in addition, the magistrate must be authorized by
    law to issue warrants in the jurisdiction where the warrant will be executed.
    United States v. Henderson, 
    906 F.3d 1109
    , 1117 (9th Cir. 2018).
    Page 9 of 22
    be executed.2 Neither Artis nor Hopkins challenges the third requirement
    demanding sufficient particularity.
    The defendants argue that we should add a fourth requirement to the list.
    They contend that a state court warrant is valid for Fourth Amendment purposes
    only if the officers who execute it are authorized to do so under state law, and that
    the warrants at issue here are invalid because they were issued to and executed by
    federal agents in contravention of California law.
    Before addressing the defendants’ argument, it is useful to separate the
    warrant process into its three distinct phases: application, issuance, and execution.
    See United States v. Freeman, 
    897 F.2d 346
    , 348 (8th Cir. 1990). First, someone
    applies for a warrant, typically a law enforcement officer or an attorney for the
    government. Second, the magistrate issues the warrant, directing it to a particular
    person or class of people. Finally, someone executes the warrant by conducting the
    search or seizure that the warrant authorizes.
    2
    Hopkins contends that the judge who issued his warrant exceeded the scope of
    her authority because agents ended up deploying the cell-site simulator in
    neighboring San Francisco County. But Hopkins points to no provision of
    California law that limits a Superior Court judge’s authority to issue a search
    warrant to the territorial boundaries of the county in which the judge sits. The few
    California cases addressing similar issues seem to point in the opposite direction.
    See, e.g., People v. Fleming, 
    631 P.2d 38
    , 42 (Cal. 1981). The district court has
    not yet addressed this argument, however, and Hopkins remains free to renew it on
    remand.
    Page 10 of 22
    The defendants really contest only the third phase of this process. They do
    not contend that Agent Carlson violated California law by applying for the
    warrants, nor could they, for California law places no limits on who may apply for
    a search warrant. See People v. Bell, 
    53 Cal. Rptr. 2d 156
    , 170–71 (Ct. App.
    1996). Nor can they contend that the warrants were improperly issued under state
    law. It’s true that under California law a search warrant must be directed to a
    “peace officer,” Cal. Penal Code §§ 1523, 1528(a), 1530, and that federal law
    enforcement officers do not qualify as peace officers, § 830.8(a). But the warrants
    in this case were directed, as state law requires, “to any peace officer” in Alameda
    County. The defendants are thus wrong in asserting that the warrants were
    improperly issued to a federal agent.
    Whether the warrants were improperly executed by federal agents is a closer
    question. California law requires search warrants to be executed by “peace
    officers,” but federal agents may assist a peace officer in executing a search
    warrant, provided the federal agent is acting “in aid of the officer on his requiring
    it, he being present and acting in its execution.” Cal. Penal Code § 1530. As the
    defendants argue, it seems doubtful that this requirement was satisfied here,
    although California courts do not appear to have addressed how strictly this
    Page 11 of 22
    provision should be construed when federal agents execute a search warrant as
    members of a joint federal-state task force that includes peace officers.3
    We find it unnecessary to decide whether federal agents violated California
    law by executing the Artis and Hopkins warrants. Even if such a violation
    occurred, the warrants would still be valid under the Fourth Amendment. An
    otherwise properly issued search warrant is not rendered void for Fourth
    Amendment purposes merely because it was executed by law enforcement officers
    who lacked warrant-executing authority under state law. See United States v.
    Green, 
    178 F.3d 1099
    , 1106 (10th Cir. 1999); United States v. Gilbert, 
    942 F.2d 1537
    , 1540–41 (11th Cir. 1991); 
    Freeman, 897 F.2d at 348
    –49.4
    Alternatively, the defendants argue that the validity of the warrants should
    be assessed under Federal Rule of Criminal Procedure 41, which establishes the
    procedures for issuance of search warrants in federal court. This argument lacks
    merit as well. Rule 41 applies only when a search is “federal in character.” United
    3
    The Hopkins cell-site simulator warrant, as noted above, did provide that federal
    agents “employed by the United States Marshals Service are authorized to assist in
    the service of this warrant.”
    4
    In Perry v. United States, 
    14 F.2d 88
    (9th Cir. 1926), we held that the Fourth
    Amendment was violated when officers without statutory authorization executed a
    search warrant. 
    Id. at 89.
    But Perry rested on the Prohibition-era view that a
    lawful Fourth Amendment search or seizure required compliance with an
    authorizing statute. See Orin S. Kerr, Cross-Enforcement of the Fourth
    Amendment, 132 Harv. L. Rev. 471, 501 (2018). Perry’s holding on that point did
    not survive Virginia v. Moore, 
    553 U.S. 164
    , 168 (2008).
    Page 12 of 22
    States v. Martinez-Garcia, 
    397 F.3d 1205
    , 1213 (9th Cir. 2005). The fact that
    federal agents were involved in conducting the search is a relevant consideration,
    but not sufficient on its own to trigger the rule’s application. United States v.
    Palmer, 
    3 F.3d 300
    , 303 (9th Cir. 1993). The search must be tied to an
    investigation into potential violations of federal law. See United States v. Duval,
    
    742 F.3d 246
    , 254 (6th Cir. 2014); United States v. Claridy, 
    601 F.3d 276
    , 282–83
    (4th Cir. 2010). The searches in question here do not fit that bill. Agent Carlson
    sought the warrants in furtherance of an investigation into state law violations
    alone—in Artis’ case, to investigate an alleged conspiracy to commit credit card
    fraud under state law, and in Hopkins’ case, to aid in locating a fugitive wanted on
    state law charges. At the time Agent Carlson applied for the warrants, no
    discussions were underway about bringing federal charges against either Artis or
    Hopkins. The provisions of Rule 41 therefore do not apply.
    III
    The sole remaining issue is whether the warrants are invalid under the
    Fourth Amendment because they were not supported by probable cause. The
    district court held both warrants invalid on this basis, and further held that the
    government could not rely on the good-faith exception to the exclusionary rule.
    We agree with the district court’s conclusion only as to the Artis warrant, which
    we address first.
    Page 13 of 22
    A
    Agent Carlson’s application for the Artis warrant requested authorization to
    search his cell phone for evidence of his involvement in a conspiracy to commit
    credit card fraud, and the supporting affidavit accordingly sought to establish
    probable cause to believe that Artis was engaged in that offense. In reviewing the
    adequacy of the probable cause showing, we must assess whether probable cause
    has been shown with respect to the offense asserted as the basis for issuing the
    warrant; whether Agent Carlson’s affidavit established probable cause with respect
    to some other offense is irrelevant. See United States v. $186,416.00 in U.S.
    Currency, 
    590 F.3d 942
    , 948 (9th Cir. 2010). We therefore reject the
    government’s assertion that the warrant may be upheld because Agent Carlson’s
    affidavit established probable cause to believe that Artis was a fugitive and that a
    search of his cell phone would yield evidence useful in finding him.
    The first obstacle the government faces in attempting to defend the adequacy
    of the probable cause showing is that the most probative evidence mentioned in
    Agent Carlson’s affidavit must be disregarded. The affidavit describes an earlier
    search that occurred when officers attempted to execute a warrant for Artis’ arrest
    at his girlfriend’s apartment. According to the affidavit, when the officers knocked
    on the front door to the apartment, it swung open. Concerned that someone might
    be inside and in need of help, the officers performed what Agent Carlson termed a
    Page 14 of 22
    “safety sweep” of the apartment. Although the officers found no one inside, in the
    course of the safety sweep they observed “several counterfeit credit cards” bearing
    Artis’ name on a kitchen counter. (The affidavit does not explain how the officers
    were able to determine, from the face of the cards alone, that they were indeed
    counterfeit.) The officers’ observation of the counterfeit credit cards obviously
    provided strong support for the conclusion that Artis was engaged in some sort of
    credit card fraud, and the judge who issued the warrant no doubt relied heavily on
    that evidence in deciding that probable cause had been shown.
    Artis contends here, as he did below, that the search of his girlfriend’s
    apartment violated his Fourth Amendment rights. He asserts as a factual matter
    that he was an overnight guest in his girlfriend’s apartment. Thus, as a legal
    matter, the officers could not rely on Artis’ arrest warrant alone as authorization to
    enter his girlfriend’s apartment: They needed a search warrant or probable cause
    to believe he was present at the time of the search, neither of which, he contends,
    they had. See United States v. Gorman, 
    314 F.3d 1105
    , 1114–15 (9th Cir. 2002).
    Artis further suggests that the officers lied when they stated the front door to the
    apartment had been left ajar, eliminating any basis for their claim that exigent
    circumstances justified a warrantless entry.
    The government conceded below that the district court should disregard the
    evidence discovered during the apartment search when assessing whether probable
    Page 15 of 22
    cause had been shown, albeit not on the ground that the officers’ entry was
    unlawful but rather because the counterfeit credit cards may not have been found in
    plain view, as Agent Carlson’s affidavit asserted. In light of the government’s
    refusal to defend the legality of the apartment search, the district court properly
    struck from Agent Carlson’s affidavit any reference to the counterfeit credit cards.
    We will follow the same course here. Having excised evidence from the
    supporting affidavit, we do not defer, as we normally would, to the issuing
    magistrate’s determination that probable cause existed. In that scenario, we have
    nothing to which we could defer, as the magistrate made no determination about
    whether probable cause exists on the set of facts now before us. See United States
    v. Kelley, 
    482 F.3d 1047
    , 1051 (9th Cir. 2007). Instead, we must “determine on
    our own whether the remaining portions of the affidavit support a finding of
    probable cause.” United States v. Job, 
    871 F.3d 852
    , 864 (9th Cir. 2017).
    The remaining portions of Agent Carlson’s affidavit fail to support a finding
    of probable cause that Artis was engaged in credit card fraud. The affidavit
    recounts the following facts: (1) Artis had outstanding arrest warrants for, among
    other offenses, identity theft; (2) Artis fled from Agent Carlson and his partner
    when they attempted to arrest him; and (3) Artis is a close associate of Hopkins,
    who also had an outstanding warrant for his arrest. Considered together, these
    Page 16 of 22
    facts fall far short of establishing probable cause regarding credit card fraud. They
    establish little more than Artis’ status as a fugitive from justice.
    The affidavit included one additional piece of evidence that merits separate
    discussion. Agent Carlson stated, without further elaboration, that a cooperating
    witness had informed him that “Artis and Hopkins are involved in a conspiracy to
    commit credit card fraud and that they are in constant communication with each
    other in furtherance of the crime.” If credited, this information would obviously
    suffice to establish probable cause to believe that Artis was engaged in credit card
    fraud. But other than the evidence obtained from the unlawful search of Artis’
    girlfriend’s apartment, which we must disregard, the affidavit offers no basis for
    concluding that the information provided by the unnamed informant was reliable.
    The affidavit does not state the informant’s basis of knowledge or provide any
    information about the informant’s reliability in the past. See Illinois v. Gates, 
    462 U.S. 213
    , 233 (1983); United States v. Bishop, 
    264 F.3d 919
    , 925 (9th Cir. 2001).
    Nor does the affidavit contain any information corroborating what the informant
    said. See 
    Gates, 462 U.S. at 242
    –43; 
    Bishop, 264 F.3d at 925
    –26.
    Contrary to the government’s argument, Artis’ outstanding arrest warrant for
    identity theft does not provide the necessary corroboration. Although identity theft
    and credit card fraud are potentially related offenses, without knowing more about
    the age of the warrant and the nature of the underlying conduct, no inferences can
    Page 17 of 22
    be drawn about whether the existence of the warrant bolstered the credibility of the
    informant’s bare accusation.
    As the district court held, after excising the evidence illegally obtained, the
    remaining portions of Agent Carlson’s affidavit fail to establish a “fair probability”
    that evidence of credit card fraud would be found on Artis’ cell phone. 
    Gates, 462 U.S. at 238
    . The search of the phone pursuant to an invalid warrant violated Artis’
    Fourth Amendment rights, requiring suppression of the fruits of that search unless
    the government can demonstrate that the good-faith exception to the exclusionary
    rule applies.
    The good-faith exception precludes suppression of evidence seized by
    officers who acted “in objectively reasonable reliance” on a search warrant that is
    later declared invalid. United States v. Leon, 
    468 U.S. 897
    , 922 (1984). However,
    we have held that the good-faith exception may not be invoked when “the search
    warrant was issued in part on the basis of evidence obtained from an illegal
    search.” United States v. Wanless, 
    882 F.2d 1459
    , 1466–67 (9th Cir. 1989); see
    also United States v. Vasey, 
    834 F.2d 782
    , 789 (9th Cir. 1987). That rule would
    foreclose the government’s reliance on the good-faith exception here.
    We acknowledge that the Supreme Court’s precedent on application of the
    good-faith exception has shifted somewhat since we decided Vasey and Wanless.
    When those cases were decided, the good-faith exception had been held to apply
    Page 18 of 22
    only when the police acted in reasonable reliance on mistakes made by others, such
    as the magistrate who issued the defective warrant in Leon. It was not yet clear
    whether the good-faith exception would apply when the police acted in reliance on
    their own mistakes. Thus, in rejecting application of the good-faith exception in
    Vasey, we stressed that “[t]he constitutional error was made by the officer in this
    case, not by the magistrate as in 
    Leon.” 834 F.2d at 789
    . The good-faith exception
    could not apply to the fruit of that constitutional violation, including evidence
    seized under the resulting warrant.
    The Supreme Court has since held that the good-faith exception can apply
    even when the police are responsible for the mistake that led to an unlawful search
    or seizure. In Herring v. United States, 
    555 U.S. 135
    (2009), the Court applied the
    good-faith exception to uphold the admission of evidence seized during a
    concededly unlawful arrest, even though the arrest occurred because law
    enforcement officials negligently failed to remove a recalled warrant from their
    database. 
    Id. at 138,
    147–48. The Court held that, to justify suppression as a
    remedy for a Fourth Amendment violation, “police conduct must be sufficiently
    deliberate that exclusion can meaningfully deter it, and sufficiently culpable that
    such deterrence is worth the price paid by the justice system.” 
    Id. at 144.
    The
    “isolated negligence” at issue in Herring, the Court concluded, did not meet that
    standard. 
    Id. at 137.
                                                                              Page 19 of 22
    In light of Herring, we can no longer declare the good-faith exception
    categorically inapplicable whenever a search warrant is issued on the basis of
    evidence illegally obtained as a result of constitutional errors by the police. We
    must instead determine whether the police misconduct that led to discovery of the
    illegally obtained evidence is itself subject to the good-faith exception. If it is,
    suppression of the evidence seized pursuant to the warrant will not be justified.
    But if the police misconduct is not protected by the good-faith exception,
    suppression is the appropriate remedy. The misconduct will by definition be
    “sufficiently deliberate” that it can be deterred through application of the
    exclusionary rule, and “sufficiently culpable” to warrant exclusion as a remedy.
    
    Id. at 144.
    And because the illegally obtained evidence will necessarily have been
    decisive in establishing probable cause (otherwise there would be no need to resort
    to the good-faith exception), evidence discovered pursuant to the warrant will be
    the fruit of that earlier illegality and subject to suppression for that reason. See
    Wong Sun v. United States, 
    371 U.S. 471
    , 485 (1963).
    Under this standard, suppression is warranted here. The government bears
    the burden of showing that the good-faith exception applies. See United States v.
    Underwood, 
    725 F.3d 1076
    , 1085 (9th Cir. 2013). In this case, it must show that
    the good-faith exception would have applied to render the counterfeit credit cards
    evidence admissible. The government cannot carry that burden because it has
    Page 20 of 22
    made no effort to defend the legality of the search that yielded the evidence in
    question. The search violated the Fourth Amendment either because the officers
    lacked authority to enter Artis’ girlfriend’s apartment in the first place, as Artis
    contends, or because the officers did not discover the credit cards in plain view, as
    the government has effectively conceded. Either way, the police discovered the
    evidence through conduct that, on this record at least, is plainly unconstitutional, in
    contrast to the kind of “isolated negligence” at issue in Herring. That misconduct
    is sufficiently deliberate that it can be deterred through exclusion of the fruit of the
    illegal search, and sufficiently culpable to warrant imposition of that sanction.
    The evidence seized pursuant to the Artis warrant must be suppressed as the
    fruit of the illegal search of his girlfriend’s apartment. As we have held,
    observation of the counterfeit credit cards was crucial to issuance of the warrant,
    since without that illegally obtained evidence probable cause was lacking. We
    therefore affirm the district court’s order granting Artis’ motion to suppress.
    B
    We next address whether probable cause supported the Hopkins warrant,
    which authorized use of a cell-site simulator to track the location of the cell phone
    using the number (832) 763-5555.
    The Hopkins warrant was predicated solely on his status as a fugitive from
    justice and the government’s legitimate interest in apprehending him. No one
    Page 21 of 22
    disputes that tracking the location of a particular cell phone will likely assist in
    locating the person using that phone. The warrant application therefore needed to
    establish probable cause to believe two things: that Hopkins was in fact a fugitive,
    and that he was currently using the targeted cell phone. Hopkins challenges only
    the adequacy of the showing as to his use of the phone.
    Agent Carlson’s affidavit recounts the following facts. After he obtained
    possession of Artis’ cell phone, the phone received “several incoming calls” from
    the number (832) 763-5555. (During the evidentiary hearing, Agent Carlson
    clarified that he saw several notifications on the locked screen of Artis’ phone
    reflecting contacts from the targeted cell phone, at least one of which was an
    incoming call. This clarification does not affect the analysis.) A search of a law
    enforcement database revealed that the number was issued to an unknown
    subscriber with Verizon Wireless. Agent Carlson contacted a cooperating witness
    who told him that Hopkins’ cell phone number was (832) 763-5555 and that the
    cooperating witness had learned this fact from Artis—someone who, as a “known
    associate” of Hopkins, would presumably know the latter’s cell phone number. If
    credited, this information from the informant would easily establish probable cause
    to believe that Hopkins was using the targeted cell phone.
    Hopkins contends that the affidavit provided no basis for crediting the
    informant as reliable because nothing disclosed in the affidavit corroborated the
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    informant’s tip. We disagree. The informant’s tip was corroborated by the fact
    that someone using the number attributed to Hopkins attempted to contact Artis,
    one of Hopkins’ associates. Had the informant simply made up a phone number
    for Hopkins, it would be a remarkable coincidence to find a missed call from that
    number on Artis’ cell phone. Hopkins assumes that Agent Carlson told the
    informant that several notifications from the number (832) 763-5555 had appeared
    on Artis’ phone and then asked the informant to confirm whether that number
    belonged to Hopkins. If accurate, this sequence of events would undoubtedly
    undermine the corroborative value of the contacts from the targeted cell phone.
    But nothing in the affidavit supports Hopkins’ version of events. And despite
    having had an opportunity to cross-examine Agent Carlson at the evidentiary
    hearing, Hopkins can point to nothing in the record to support his factual narrative.
    The informant’s tip plus the corroborating notifications found on Artis’ phone
    sufficed—although barely—to establish probable cause that Hopkins was using the
    targeted cell phone.
    Because the Hopkins warrant is valid under the Fourth Amendment, we need
    not address whether the good-faith exception to the exclusionary rule applies as to
    this warrant. We reverse the district court’s order granting Hopkins’ motion to
    suppress.
    AFFIRMED IN PART, REVERSED IN PART, and REMANDED.