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 Page 22 of 22

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.