OPINION
We allocate to a defendant the burden of proving that a prior conviction was unconstitutional when a defendant challenges the use of the prior conviction in ealculat-ing a later sentence under the federal Sentencing Guidelines. Because the burden of establishing the constitutionality of prior convictions was improperly assigned to the government in this case, we vacate the district court’s sentence and remand for further proceedings.
I
Ralph Perez Dominguez pled guilty to one count of a nine-count indictment: possession with intent to distribute 100 to 1,000 kilograms of marijuana, in violation of 21 U.S.C. §§ 841(a)(1), (b)(l)(B)(vii). Dominguez entered his guilty plea pursuant to a written plea agreement. The plea agreement stated: “This agreement is expressly conditioned on the defendant’s criminal history falling within Category I of the Sentencing Guidelines. If the defendant’s criminal history exceeds Category I, the government reserves its right to withdraw from the plea agreement.” After receiving Dominguez’s guilty plea, the district court ordered the preparation of a Pre-sentence Report.
The Presentence Report stated that Dominguez had three prior misdemeanor convictions, placing Dominguez in Criminal History Category II. On December 27, 2001, the United States moved to withdraw from the plea agreement because Dominguez’s criminal history did not fall within Category I. Dominguez opposed the government’s motion.
The district court held a hearing on the motion on January 22, 2002. At the hearing, the district court,
sua sponte,
questioned whether there was sufficient proof that Dominguez’s waivers of counsel in his prior convictions were valid. The district court ordered the parties to consider whether Dominguez’s prior waivers resulted in convictions that could be counted for sentencing purposes, stating that “there
After the parties briefed the issue, the district court again heard oral argument. The district court, relying on
United States v. Akins,
II
The United States argues that the district court impermissibly placed on the government the burden of proving that Dominguez validly waived counsel in his prior convictions. We review
de novo
the district court’s assessment of prior convictions in calculating a defendant’s criminal history category.
United States v. Allen,
A
In
Allen,
we stated that “in the ‘context of considering a constitutional challenge to a prior conviction in the criminal history calculation ... the ultimate burden of proof in demonstrating the constitutional infirmity of the ... conviction lies with the defendant.’ ”
Id.
at 1041 (quoting
United States v. Newman,
Allen
is clear: “A defendant must prove the invalidity of a prior conviction by a preponderance of the evidence. To do so, the defendant must present evidence sufficient to overcome the presumption that there was a valid waiver of counsel.”
Allen,
Mulloy is instructive in this case. The government in Mulloy appealed a sentence, contending that the district court improperly placed the burden on the government to show that the defendant’s prior convictions were constitutionally valid. Id. We agreed with the government and concluded that “we must vacate the sentence and remand for further proceedings because the court seems to have read the partial silence of the record to the government’s disadvantage. The effect was to place the burden of showing validity of the convictions on the government, contrary to [the] presumption of regularity.” Id. at 1340.
The district court here relied on Akins to hold that the government bears the burden of showing the constitutionality of prior convictions to be used for sentencing purposes. But our decision in Akins did not alter the clear course charted by Allen and Mulloy. As an initial matter, Akins never mentioned Allen, Mulloy, or the other cases placing on the defendant the burden of showing the invalidity of prior convictions to be used for the Guidelines sentencing calculation. Allen and Mulloy remain good law. 2
Akins
is simply not pertinent to cases, such as this one, where a prior conviction is used only to enhance a defendant’s criminal history score under the United States Sentencing Guidelines. The government charged Akins with possessing a firearm after having been convicted of “a misdemeanor crime of domestic violence.”
Akins,
C
The district court erred when it placed the burden on the United States to show that Dominguez validly waived counsel in his prior convictions.
Akins,
as amended, provides no support for the district court’s shifting of that burden. We VACATE
Notes
. The record is unclear whether the district court relied upon the original or the amended version of Akins. But because the district court ordered the parties to examine this issue on December 27, 2001, we published our amended Akins opinion on January 10, 2002, and the district court heard argument on January 22, 2002, it is quite possible that the district court relied on the original version of Akins.
. The panel in
Akins
could not have overruled these precedents, even if it had wanted to.
See, e.g., United States v. Johnson,
.
Akins
was issued and then subsequently amended. The initial opinion in
Akins
stated that "[t]he government thus has the burden of proving beyond a reasonable doubt a knowing and intelligent waiver of the right to counsel in the predicate offense."
Akins,
We recognize that the changes to
Akins
did not bring that opinion into complete harmony with
Allen
and
Mulloy.
Although the amendments to
Akins
removed all language expressly assigning the burden to the government, the amended
Akins
opinion held that valid waiver of counsel was not demonstrated where "the record in this case does not establish that Akins chose to waive the right to counsel with 'eyes open.’ "
Akins,
