Opinion by Judge REINHARDT.
The issue in this case is whether Montana law enforcement officers who arrest probationers for violating the terms of their probation must do so in accordance with Mont. Code Ann. § 46-23-1012. We hold that they must, and reverse Shephard’s conviction. 1
I.
On July 7,1989, an informant told Missou-la County Sheriff Deputy Willis Hintz that Mark Allen Shephard, on probation for a state felony, was not complying with the condition of his probation that required him to attend regular meetings in Helena, Montana. He also told Hintz that Shephard had written some bad cheeks. Hintz informed Shephard’s probation officer, who orally authorized Hintz to arrest Shephard. 2
Hintz and another deputy went to the house where Shephard was staying, knocked at the door, and were told to come in. They opened the door, saw Shephard among a group of people in the living room, and asked him to step outside with them. Outside, they told him that he was under arrest for probation violation. Shephard asked Hintz to go back inside to retrieve his wallet for him. Leaving Shephard outside with the other deputy, Hintz entered the apartment. In Shephard’s bedroom, Hintz saw the wallet and a Ruger .22 calibre revolver in plain view on a bedside table. Another man in the apartment told Hintz that the gun belonged to Shephard, and Hintz seized the gun. A later identification by the seller confirmed that Shephard was the owner.
Shephard was charged with being a felon in possession of a firearm in violation of 18 U.S.C. § 922(g)(1). He moved to suppress the revolver and the identification on the ground that he had been arrested illegally, contending that Mont.Códe Ann. § 46-23-1012 required that Hintz obtain either a court order or written authorization from a probation or parole officer to arrest him for a probation violation. 3 After a hearing, the *936 district court denied the motion. Shephard then entered a conditional guilty plea, reserving the right to appeal the denial of his motion. He was sentenced to time served (eight-and-a-half months) and three years of supervised release, and was released to a state detainer. This appeal follows.
II.
A.
We look to state law to determine the lawfulness of an arrest by a state officer for a state offense.
Ker v. California,
Under Mont.Code Ann. § 46-23-1012, an arrest for probation violation may be made in one of two ways: 1) any probation or parole officer may make a warrant-less arrest; or 2) any police officer 7 may make the arrest if a parole or probation officer has given him or her written authority to do so. It is undisputed that Shephard was arrested for violating probation, that he was arrested by a police officer, and that the police officer did not have written authority from Shephard’s probation officer. Thus, it seems clear that Shephard’s arrest was obtained in violation of § 46-23-1012. 8
B.
The government contends that, the unequivocal language of § 46-23-1012 notwithstanding,
State v. Burke,
Like Shephard, the probationers in
Burke
were arrested for violating the terms
*937
of their probation, and, like Shephard, they were arrested, evidently in violation of § 46-28-1012, after their probation officer orally authorized a police officer to arrest them. However, unlike Shephard, the probationers in
Burke
did not contend that their arrest was illegal. Still less did they contend that it was illegal because the arresting officer did not comply with § 46-23-1012. In fact, the opinion does not mention the statute. Instead, the
Burke
probationers argued that the searches of their car and house were illegal. They based their contention on the view that the conditions of their probation were invalid under then-existing Montana ease law.
HI
In the alternative, the government argues that its warrantless arrest of Shephard was proper under Mont.Code Ann. § 46-6-311, which permits such an arrest if authorities have probable cause to believe that the arres-tee has committed an offense and exigencies do not permit the issuance of a warrant. 12 Assuming that Deputy Hintz had probable cause to arrest Shephard for violating the terms of his probation, 13 and assuming that probation violation is an offense, 14 we find no exigent circumstance.
*938
Exigent circumstances are “those circumstances that would cause a reasonable person to believe that ... prompt action [ ] was necessary to prevent physical harm to the officers or other persons, the destruction of relevant evidence, the escape of the suspect, or some other consequence improperly frustrating legitimate law enforcement efforts.”
United States v. McConney,
Here, the ¡government has not met its burden. In fact, there simply were no exigent circumstances, of any kind, under any standard. The government put forward only one specific fact to establish exigency: at oral argument, it contended that Shephard’s failure to report to his probation officer constituted a ground for warrantless arrest. However, Shephard was not ordered arrested because ■ of his failure to report to his probation officer, but rather for his failure to attend required meetings and his issuance of bad cheeks. Moreover, the government did not show, and we cannot discern, how any of those three reasons implied that Shephard was a danger to himself or to others, that he would destroy evidence if not immediately arrested, that he was planning to flee, or that another “consequence improperly frustrating legitimate law enforcement efforts” would occur before a warrant could be issued.
Compare State v. Hammer,
Moreover, Shephard’s underlying offense — probation violation — is relatively minor. One of the allegations that gave rise to the violation — failure to attend meetings — is also minor,, and the other — passing bad checks — is not, by itself, sufficiently grave to constitute an exigency.
15
Compare State v. Dow,
An exigency is an emergency so pressing that a warrant cannot be obtained. Only where police must react immediately may they disregard the warrant requirement. The government has made no showing of any sort of urgency here. It has therefore, a fortiori, failed to show that the circumstances were such that the warrant requirement could be disregarded. 16
IV.
A.
Having concluded that Hintz illegally arrested Shephard, we now turn to the question whether the fruit of that illegal arrest— Shephard’s gun — must be suppressed. First we note that evidence in a federal prosecution must be suppressed if it was the product of an arrest illegal under state law.
United States v. Mota, supra; see also Henry v.
*939
United States,
We next consider the further question whether there is a sufficiently close relationship between the illegal arrest and the seizure to necessitate suppression. The Supreme Court has rejected a “but for” test for determining whether evidence from an illegal arrest must be suppressed.
See Wong Sun v. United States,
B.
Our inquiry is conducted by means of a three-factor test. First, we consider the proximity of the illegal arrest with the seizure of the evidence. Second, we consider whether there were independent intervening events that led the police to the evi-. dence. Third, we consider the effect of suppression on the exclusionary rule’s purpose of deterring police misconduct.
See United States v. Jones,
Applying the three-factor test, we conclude that the seized evidence must be suppressed. The first factor, “proximity,” weighs heavily in favor of suppression. Hintz seized the evidence immediately after Shephard’s illegal arrest. Within moments of the arrest, She-phard asked for his wallet, and Hintz entered the bedroom and found the gun. It would be difficult to find a case with much greater proximity, except for a search of the person at the moment of the arrest.
Second, there were no independent intervening events that contributed to the deputy’s seizure of the gun. Shephard’s illegal arrest and Hintz’s seizure of the evidence were so closely related, both temporally and otherwise, that they must be treated as a single. act. If someone is arrested without his wallet, he will undoubtedly ask for an opportunity to retrieve it before being taken to the police station. Wallets normally contain not .only money, which is useful in jail, but identification and other important papers. Here, it was a request to retrieve a wallet that led to the discovery of the evidence. Whether the arrestee asks permission to retrieve the necessary personal property himself, in which case the officer would accompany him and thereby observe the evidence and seize it, or whether the arrestee asks the officer to retrieve the property for him and the officer then seizes the evidence, the result is the same. The officer observes the evidence and seizes it as an inextricable part of the arrest. The same considerations would obtain if the arrestee were outside and dressed in shorts or a bathing suit. ■ He would clearly have the right to go in the house and retrieve his clothes or to ask the arresting officer to do so for him. Either way, the officer’s observations of contraband or other evidence while clothes (or a wallet) were being obtained would undoubtedly constitute a part of the arrest and not be the product of intervening events. Accordingly, the “intervening act” factor, like “proximity,” weighs heavily in favor of suppression.
Third, the suppression of the gun would deter state officers from routinely making unlawful arrests in the knowledge that an opportunity to view the personal premises or effects of the arrestee will almost inevitably and immediately follow. The record makes clear that state officers in Montana have openly flouted the Montana statute that requires arrest warrants to be in writing. The arrest and seizure in this case was but a single overall act, and that will frequently be the case. If courts do not suppress the seizure- of evidence obtained from an arres-tee’s home at the time of his arrest, law *940 enforcement officers will have an incentive to make unlawful arrests in the expectation of viewing the arrestee’s private premises and personal effects. Accordingly, the “deterrence” prong also weighs strongly in favor of suppression.
In addition, the discovery of the inculpato-ry evidence here was not serendipitous. No wholly unrelated crime was discovered by chance. To the contrary, not only were the arrest and the seizure of the gun inextricably linked, but the crime for which Shephard was ultimately charged is closely related to the grounds for his illegal arrest. Shephard’s additional crime (e.g., being a felon in possession of a firearm) was directly linked to his status as a felon.
In sum, all three factors, and more, weigh strongly in favor of suppression. The closeness of the connection between the illegal arrest and the seizure of the evidence mandates that result in this case.
C.
We conclude that the evidence seized from Shephard’s bedroom at the time of his illegal arrest must be • suppressed. 17
V.
Shephard was arrested in violation of Mont.Code Ann. § 46-23-1012. The case upon which the government relies to establish that the statute need not be followed does not support the government’s position. Further, no exigent circumstances existed to justify the arrest under Montana law. Because the illegal arrest and the seizure of the evidence were closely connected and meet the three-part test for determining “exploitation,” the seized evidence, specifically the revolver and the identification, must be suppressed. Shephard’s conviction is therefore reversed.
REVERSED and REMANDED.
Notes
. Shephard additionally contends that his arrest was invalid because he was arrested at home not pursuant to a warrant. In view of our reversal on statutory grounds, we do not reach this issue.
. After Shephard was arrested, Hintz executed a written authorization.
. The statute provides:
46-23-1012. Arrest when violations of probation alleged.
(1) At any time during probation or suspension of sentence a court may issue a warrant for the arrest of the defendant for violation of any of the conditions of release or a notice to appear to answer to a charge of violation. Such notice shall be personally served upon the defendant. The warrant shall authorize all officers named therein to return such defendant to the custody of the court or to any suitable detention facility designated by the court.
(2) Any probation and parole officer may arrest such defendant without a warrant or may deputize any other officer with power of arrest to do so by giving him a written statement setting forth that the defendant has, in the judgment of said probation and parole officer, violated the conditions of his release. Such written statement delivered with the defendant by the arresting officer to the official in charge of a county jail or other place of detention shall be sufficient warrant for the detention of the defendant. The probation and parole offi *936 cer, after making an arrest, shall present to the detaining authorities a similar statement of the circumstances of violation.
(3) Provisions regarding release on bail of persons charged with crime shall be applicable to the defendants arrested under these provisions.
Mont.Code Ann. § 46-23-1012.
. In addition to the plurality, Chief Justice Warren and Justices Douglas, Goldberg, and Brennan adopted this holding.
See id.
at 62,
. Our conclusion holds only insofar as state law does not violate the Fourth Amendment.
Ker,
. Under Montana law, an "offense" is "a crime for which a sentence of death or of imprisonment or a fine is authorized. Offenses are classified as felonies or misdemeanors.” Mont.Code Ann. § 45-2-101(42). Probation violation is nowhere so classified, although a probationer may be arrested for allegedly violating the conditions of probation, Mont.Code Ann. § '46-23-1012, and the law requires that a hearing be held on the matter, after which probation may be revoked, Mont.Code Ann. § 46-23-1013.
. As noted above, the statute describes “any ... officer with power of arrest." See supra note 3. For convenience, we refer to such officers as police officers.
. A search of Montana case law reveals very few cases that treat § 46-23-1012. Apparently, no probationer has sought to enforce its provisions. We find this particularly surprising since the statute seems to be honored in the breach. She-phard's probation officer had never heard of the statute or. its contents and Deputy Hintz testified at Shephard’s suppression hearing that it was “standard practice in the Missoula area” to arrest probationers for probation violations solely on an oral authorization from the probation officer.
. The government contends that
State v. Plouffe,
. Law enforcement officers may, of course, conduct a warrantless search incident to a lawful arrest.
United States v. Robinson,
Furthermore, although the terms of She-phard's probation required him to submit to war-rantless searches, the Ruger was not retrieved as the result of a search. Like the probationers in Burke, Shephard was required by the terms of his probation to submit to warrantless searches of "himself, his vehicle, and his residence ... by lawful authorities upon reasonable request of his probation officer.” However, here the probation officer testified that he made no such request, directly or indirectly. Moreover, Deputy Hintz's actions did not constitute a "search." The undisputed testimony at Shephard’s suppression hearing established that Deputy Hintz entered the apartment at Shephard's request, to retrieve his wallet — not to conduct a search. In any event, the government does not contend that a search was either authorized or conducted. Therefore, we cannot say that the Ruger revolver was seized as the result of a lawful search.
. The government additionally contends that the liberty of probationers is restricted, and that therefore, under
Griffin v. Wisconsin,
. The relevant portion of the provision states:
Basis for arrest without warrant. (1) A peace officer may arrest a person when no warrant has been issued if the officer has probable cause to believe that the person is committing an offense or that the person has committed an offense and existing [sic] circumstances require immediate arrest.
Mont.Code Ann. § 46-6-311.
. The government argues that a violation of probation establishes probable cause to detain the violator.
State v. Pease,
. See supra note 6. As noted above, Deputy Hintz was informed not only that Shephard had failed to attend the meetings required under the terms of his probation, but also that he had written some bad checks. However, neither Hintz nor any other witness at Shephard's suppression hearing testified that Shephard was arrested for any reason other than his probation violation. Nothing suggests that he was arrested *938 for the financial offense that partially underlay the violation or that probable cause existed to arrest him on that basis.
. The terms of Shephard's probation prohibited him from possessing firearms. However, possession of firearms was not a ground for arresting Shephard for violating his probation.
. The government does not contend that the first part of § 46-6-311 is applicable here. It does not suggest that Shephard was committing an offense at the time he was arrested simply because of his status as a probation violator. Any such-construction of the statute would in any event conflict with the provisions of § 46-23-1012.
.
United States v. Foppe,
United States v. Jones,
