Rеversed and remanded by published opinion. Judge K.K. HALL wrote the opinion, in which Justice POWELL and Judge WILKINSON joined.
OPINION
The government appeals an order suppressing evidence seized pursuant to a warrant applied for by state authorities and issued by a state judge over the telephone. We hold that the officers acted in good faith reliance on the validity of the warrant, and we reverse the suppression order and remand for further proceedings.
I
Montgomery County, Maryland, police received information that Gregory Wayne Clutchette had absconded from parole in California in 1975 and might be living in Maryland. Investigаtion revealed that a man driving a black Mercedes and identifying himself as “al Qawi” had been arrested in Maryland in 1988 for assaulting an officer and resisting arrest. A subsequent check revealed that al Qawi’s fingerprints matched Clutehette’s. He had given an address that turned out to be that of a mail receiving service at whiсh al Qawi had rented a mail box. Montgomery County police, who had a warrant for Clutchette’s arrest, began sur-veilling this mail box and observed various persons collecting its contents and driving to a home on Foxlair Road in Gaithersburg or one on Walnut Creek Court in Germantown. A Walnut Creek neighbor told police that a man living there fit Clutchette’s description and drove a black Mercedes.
On April 3, 1992, the police saw a black Mercedes at the Foxlair address. They staked out the home at 1:45 P.M. and radioed for assistance. By 2:30 P.M., five officers were present. The officer in charge, Detective Patterson, decidеd to get a search warrant to enter the two homes. Contacted by *579 radio, his supervisor, Sergeant Kessler, agreed with Patterson’s assessment that none of the officers could be spared to leave to obtain a warrant in person. Kessler put Patterson in touch with Assistant State’s Attorney Thomas Tamm, and Tаmm and Patterson discussed getting a warrant via telephone to search the two residences. Tamm told Patterson that it was possible to obtain a telephonic warrant and that such warrants had been issued in the past. Tamm also spoke to Judge James Ryan of the Maryland Circuit Court and discussed the proсedures to be followed.
Patterson then called Judge Ryan and explained the circumstances, including the officer’s fear that he could not spare anyone to apply for the warrant in person. Patterson recorded his end of the conversation. Although it is unclear whether Judge Ryan thought that Pattеrson’s equipment would be recording him (the judge) as well, Judge Ryan made his own contemporaneous notes of the conversation. Patterson’s recording disclosed that he recited an oath. Judge Ryan approved the warrant applications over the phone.
Officer Patterson requested the assistance of a SWAT team to execute the warrants. Before the police were able to attempt to execute them, however, Clutchette left the house in his Mercedes followed by two women in another car. He was arrested a mile from the house, and the two women were detained. One of the women, Priscilla Clarke, was carrying a loaded handgun. Informed of the search warrants, Clarke told the police that she owned the Foxlair house and that there was another gun there. The Foxlair search, which was conducted at about 6:00-6:30 P.M., turned up several guns as well as a picture of Clutсhette holding a shotgun found in the search. Clarke gave the police a key to the Walnut Creek house, and that search turned up several more guns.
Four days later, Patterson provided Judge Ryan with written affidavits and proposed warrants that were consistent with the earlier telephone conversatiоn. The judge signed the warrants.
II
Clutchette was charged with two counts of violating 18 U.S.C. § 922(g), felon in possession of a firearm, for two of the guns found in the Foxlair house. He moved to suppress the guns on the ground that the telephonically-procured warrants were invalid under Maryland law. A hearing was held at which Judge Ryan, Patterson, Tamm, and one of the searching officers testified. The court ruled that, although telephone warrants are not per se violative of the Fourth Amendment, Maryland law makes no provision for such warrants and there was no valid reason for departing from the state statutory requirement that the warrant apрlication be in writing. Accordingly, the court ordered that the evidence seized during the searches of the two residences be suppressed.
The government appeals.
III
A
The Fourth Amendment requires that warrants (1) be issued by a neutral and detached magistrate, (2) be based upon probable cause supported by oath, and (3) contain а particular description of the place to be searched and things to be seized. Evidence obtained in violation of the Fourth Amendment is subject to exclusion at trial.
Mapp v. Ohio,
Instead of basing its decision on one of the above-enumerated components-bias on Judge Ryan’s part, failure оf Patterson to take an oath, insufficient probable cause that evidence of a crime would be found in the places to be searched, or lack of particularity in describing the places to be searched or the
*580
things to be seized
1
— the court based the suppression order on a finding that “there was nоt sufficient reason to depart from the written warrant requirement” contained in Md.Code Ann. Art. 27, § 551(a) (1992 Repl. Vol.). Additionally, the district court determined that the warrants were unsalvageable even under the good faith exception established in
Leon,
B
It might be best to begin with what the district court did not rely on in ordering suppression. In its memorandum opinion, the district court stated that “[t]he tape recording of Officer Patterson’s voice discloses that he explained the reasons for the search warrant, described the locations to be searched, and explained the type of evidence the officers were seeking. The tape also contains an oath by Officer Patterson....” The court did not hold that Officer Patterson’s stated grounds for a warrant did not establish probable cause to believe that evidence of a crime would be discovered at the place to be searched. There is no indication that the infоrmation related by Patterson with regard to the existence of probable cause was false, and there is also no basis to believe that Judge Ryan was anything less than “neutral and detached.” 3 Finally, the district court did not rule that the warrants failed to describe the place to be searched and the things to be seized with sufficient particularity. The source of the invalidity was state law.
C
The focus of the district court was on whether it was necessary to proceed via telephone rather than in person. While the Fourth Amendment was certainly not violated by Officer Patterson’s possible overestimation of thе exigencies of the situation, the court was unable to fully accept Officer Patterson’s concerns about the need to act over the telephone. These concerns were that none of the officers or vehicles at the Foxlair stakeout could be spared to travel to apply for the warrant in person because he did not know how many persons were in the house. Moreover, it was known that one of the women at the house had a gun permit. The court noted that no attempt was made to contact other units for assistance, despite the passage of about two hours between the issuance of the warrant and the arrest of Clutchette. The court, while conceding that telephone warrants obtained by Maryland police “may not violate the Fourth Amendment -per se,” went on to hold that “such a *581 procedure is not justified unless there are reasons for departing from the written warrant requirement.” Thе court found that there were no exigent circumstances that would justify the warrants in this case.
In this circuit, we have yet to address how, if at all, violations of
state
law in the issuance of a state warrant affect the exclusionary rule analysis set forth in
United States v. Leon,
We turn instead to the question of the reasonableness of the officers’ reliance on the warrants’ validity. 4
D
Although
a warrant issued by a magistrate normally suffices to establish that a law enforcement officer has acted in good faith in conducting the search ... the officer’s reliance on the magistrate’s probable-cause determination and on the technical sufficiency of the warrant he issues must be objectively reasonable, ... and it is clear that in some circumstances the officer will have no reasonable grounds for believing that the warrant was properly issued.
Leon,
E
Officer Patterson first called his supеrior, Sergeant Kessler, who apparently agreed with Patterson’s assessment that no officers should leave to apply for the warrant in person. Kessler and Patterson explained the situation to State’s Attorney Tamm, who in turn spoke to a number of attorneys in his office about the possibility of obtaining a telephone warrant. Satisfied that the procedure was legal and feasible, Tamm spoke to Judge Ryan and was told to have Patterson call. Although he had never issued a telephone warrant before, Judge Ryan accepted Patterson’s representation that “there was some emеrgency to it. On that basis, I felt it was appropriate.” This sequence of events strongly militates in favor of finding objectively reasonable reliance on the warrants’ validity.
See United States v. Brown,
The test is one of objective reasonableness.
United States v. George,
The order suppressing the evidence uncovered in the search of the Foxlair and Walnut Creek residences is reversed, and the case is remanded for further proceedings.
REVERSED AND REMANDED.
Notes
. The post-search application for the warrant speaks of searching for evidence of the “crimes of escape; harboring a fugitive; failure to appear ..., this evidence being the body of Clutchette; papers tracing Al [sic] Qawi and his real identity; documents pertaining to harboring and escape.” The district court noted that "[t]he tape recording оf Officer Patterson's voice discloses that he explained the reasons for the search warrant, described the locations to be searched, and explained the type of evidence the officers were seeking."
. While the need to proceed over the telephone may have subsided, probable cause for the search was not appreciably diminished after Clutchette’s arrest.
Cf. United States v. Ricciar-delli,
.The district court expressed some concern that it was unable to "reconstruct the full record upon which Judge Ryan issued the warrants ...” and felt that this detracted from the warrants' validity. However, the record, which includes the tape recording of Patterson's half of the telephone conversation with Judge Ryan, gives us at least as much information as would have been presented in a written application.
. In
Leon,
the Supreme Court noted that reviewing courts have the discretion to consider the questions of the officers' good faith without deciding the Fourth Amendment issue.
