Arrested for unlawful possession of firearms in violation of 18 U.S.C. § 922(g), the defendant moved to suppress evidence of the firearms on the ground that the search warrant pursuant to which they had been seized was not supported by probable cause. The district court denied the motion, whereafter a conditional plea of guilty was entered and the defendant was convicted and sentenced. Upon review, we conclude that there was no error in the denial of the suppression motion. The judgment of conviction and sentence will be affirmed.
I
Lexington, Tennessee, is located in a dry county. In December of 1998 Agent James Lawson, of Tennessee’s Alcoholic Beverage Commission, received information from a Lexington police officer, Todd Bowman, that a confidential informant had purchased liquor at the residence of the defendant, Charlie Parker, who lived in Lexington. In support of an application for a search warrant, Lawson prepared a hand-written affidavit in which he averred that:
“Lexington Police Dept. Officer Todd Bowman (whom affiant knows to be a rehable person) who [sic] told this affiant that his (Bowman’s) reliable, confidential informant had been on the premises described above [ie., Parker’s] within the last 72 hours and that said informant stated to Officer Bowman that the informant had purchased intoxicating liquor from the hands of Charlie R. Parker while inside the residence. Officer Bowman also stated that this informant’s information has lead to many arrests and convictions in the past.”
The affidavit did not disclose that Lawson and Bowman had sought to corroborate the informant’s allegations. They had in fact done so, however; the officers had driven the informant to Parker’s residence, dropped him off, and picked him up after he had evidently succeeded in purchasing liquor from Parker again. The facts of the controlled buy were reported orally to General Sessions Judge Steve Beal, the magistrate to whom the officers applied for the search warrant.1
On New Year’s Eve of 1998, warrant in hand, Agent Lawson and others raided Parker’s house. Several bottles of liquor were discovered on the premises, along with two 12 gauge shotguns and a .22 caliber rifle. Parker being a convicted felon, he was charged with unlawful possession of a firearm in contravention of 18 U.S.C. § 922(g).
After his indictment on the firearms charge, Parker moved to suppress the weapons seized in the raid. The district court held an evidentiary hearing on the matter. At the conclusion of the hearing, acknowledging a measure of frustration over the lack of uniform standards in cases of this sort, the district court held that there was probable cause for the search. With the approval of the court and the consent of the Government, Parker then entered a conditional plea of guilty pursu*284ant to Rule 11(a)(2), FedR.Crim.P. In due course he was convicted and sentenced, and the timely filing of a notice of appeal has now brought the case here.
II
A district court’s denial of a motion to suppress evidence generally involves questions of fact, the resolution of which is subject to review under a “clearly erroneous” standard. The evidence presented on a suppression motion is to be examined “in the light most likely to support the district court’s decision.” United States v. Williams, 962 F.2d 1218, 1221 (6th Cir.), cert. denied, 506 U.S. 892, 113 S.Ct. 264, 121 L.Ed.2d 194 (1992); see also United States v. Blevins, 2000 WL 1597821 (6th Cir. Oct. 20, 2000). Review of the trial court’s disposition of questions of law is, of course, conducted de novo. See Williams, id.
A. PROBABLE CAUSE
Was Judge Beal, the issuing magistrate, entitled to factor the controlled buy into the probable cause calculus? Although the officers (or one of them) orally told the judge about the controlled buy, it was not mentioned in Agent Lawson’s sworn affidavit.
If we assume that the officer was under oath when he told Judge Beal about the controlled buy, the information thus imparted was clearly entitled to consideration. See United States v. Clyburn, 24 F.3d 613, 617 (4th Cir.), cert. denied, 513 U.S. 907, 115 S.Ct. 274, 130 L.Ed.2d 192 (1994).2 If we assume that the officer was not under oath, however, our caselaw teaches that the information would have to be disregarded. Probable cause affidavits are not to be supplemented with unsworn statements. See Tabasko v. Barton, 472 F.2d 871, 874 (6th Cir,1972), cert. denied, 412 U.S. 908, 93 S.Ct. 2288, 36 L.Ed.2d 974 (1973).
The record before us does not disclose whether the supplemental statement made to Judge Beal was given under oath. Neither party raised this issue in the district court, and we shall pretermit the question here. Without so deciding, we shall assume for purposes of this opinion that the statement was not sworn. On the same basis, we shall assume that, standing alone, Officer Lawson’s affidavit was insufficient to show probable cause.
B. GOOD FAITH RELIANCE
Mr. Parker would have us suppress the seized evidence under the “exclusionary rule” that the courts have developed in an effort to put teeth in the Fourth Amendment. See Mapp v. Ohio, 367 U.S. 643, 81 S.Ct. 1684, 6 L.Ed.2d 1081 (1961). But the courts have developed a “good faith” exception to the exclusionary rule, see United States v. Leon, 468 U.S. 897, 104 S.Ct. 3405, 82 L.Ed.2d 677 (1984), and we address that exception now.
The test prescribed by Leon is “whether a reasonably well' trained officer would have known that the search was illegal despite the magistrate’s authorization.” Id. at 922 n. 23. Mr. Parker argues that, *285based on the facts available to the arresting officers, a reasonably well trained officer could not have concluded that it would be lawful to execute the search warrant. We disagree.
Our recent Fourth Amendment decisions teach that to establish probable cause for issuance of a search warrant on the basis of information furnished by an informant, the applicant for the warrant must provide evidence of the informant’s reliability. See, e.g., United States v. Allen, 211 F.3d 970 (6th Cir.)(en banc), cert. denied, 531 U.S. 907, 121 S.Ct. 251, 148 L.Ed.2d 181 (2000); United States v. Williams, 224 F.3d 530 (6th Cir.2000), cert. denied, — U.S.-, 121 S.Ct. 821, 148 L.Ed.2d 704 (2001). In Williams, as in the case at bar, the affidavit offered in support of the application for a warrant was very short. The identity of the informant was not disclosed, but oral testimony given by the officers attested to the informant’s reliability. Id. at 533. The combination of the affidavit and the testimony was held sufficient to satisfy the probable cause requirement.
The affidavit in the case at bar, as we have seen, attested to the informant’s past reliability and described a recent purchase of contraband at Mr. Parker’s residence. In addition, as we have also seen, the judicial officer from whom the warrant was being sought was told of the controlled buy that was made shortly before presentation of the application for a warrant. The independent corroboration of the informant’s allegations through the controlled buy tended to confirm the informant’s story, and it obviously gave the officers and Judge Beal good reason to believe that a search would uncover additional illegal alcohol.
In a factual setting similar to this, we have held Leon applicable. See United States v. Evans, 12 F.3d 215, 1993 WL 476983 (6th Cir. Nov. 18,1993). There the officer gave the magistrate an oral statement that was adequate to show probable cause. The magistrate summarized the oral statement in an affidavit which the government conceded was insufficient standing by itself. The record did not disclose whether the officer’s oral statement had been made under oath. Id. at *3. Despite the cursory affidavit, and notwithstanding the possibility that the oral statement was not sworn, we held that the officer could rely on the warrant. Id. at *4.
A similar result is called for, we believe, in the case at bar. Here the officers and the judge knew of the informant’s very recent purchase of contraband from Mir. Parker’s residence. There was no reason to suppose that Mr. Parker had subsequently moved his bootlegging operations away from his house. See United States v. Fairchild, 940 F.2d 261, 264-65 (7th Cir.1991) (holding that reliance on the apparent validity of the warrant was objectively reasonable when the informant had recently witnessed the illegal possession and the officers had no reason to believe that the drugs had been removed). The magistrate’s presumed error in failing to require sworn testimony is not chargeable to the officers. See Leon, 468 U.S. at 921 (“Penalizing the officer for the magistrate’s error, rather than his own, cannot logically contribute to the deterrence of Fourth Amendment violations”). The facts known to the officers and described to Judge Beal were fully sufficient to establish probable cause, and the officers could, in objective good faith, rely on the warrant which the judge saw fit to issue.
AFFIRMED.
. Lawson's testimony suggests that the controlled buy was not mentioned to Judge Beal. Bowman testified to the contrary, however, and the district court credited Bowman’s testimony that the judge was informed of the buy. We cannot say that the district court’s credibility determination was clearly erroneous.
. Mr. Parker maintains that Tennessee law precludes the consideration of facts outside the affidavit. See State v. Henning, 975 S.W.2d 290, 295 (Tenn.1998). The validity of a search warrant under the Constitution of the United States, however, is governed by federal law regardless of any conflict with state law. See Clyburn, 24 F.3d at 614-17, and United States v. Wright, 16 F.3d 1429, 1437 (6th Cir.), cert. denied, 512 U.S. 1243, 114 S.Ct. 2759, 129 L.Ed.2d 874 (1994) ("The fact that the arrest, search, or seizure may have violated state law is irrelevant as long as the standards developed under the Federal Constitution were not offended”).