Carlos Whitehead was convicted by a jury of manufacturing and possessing cocaine base with intent to distribute, a felony in violation of 21 U.S.C. § 841(a)(1); and possession of heroin, cocaine, and marijuana, misdemeanor violations of 21 U.S.C. § 841(a). The district court 1 sentenced Whitehead to a mandatory minimum of life imprisonment for the felony and concurrent three-year sentencеs on each of the misdemeanors. Whitehead appeals from his sentence and conviction. We affirm.
I. Background
Officers of the St. Louis Police Department, including Detective John Applegate, entered a second floor apartment at 4220 Ellenwood with a search warrant at the culmination of a narcotics investigation of the residence. They encountered Whitehead standing in a hallway. As Whitehead expressed surprise over the officers’ presence, the kitchen microwave “dinged.” In the microwave, officers found a glass vial containing a damp off-white substance that Applegate believed to be crack cocaine. *1070 Next to the appliance was a small baggie of powder cocaine, seven chunks of loose crack cocaine, and one chunk of crack cocaine wrapped in clear plastic. Applegate also noticed and seized a metal spoon and knife on the kitchen counter, as well as a box of sandwich bags and a coffee grinder — items commonly used in narcotics manufacturing and distribution. In the bedroom, the officers found heroin and marijuana, as well as a digital scale, white residue, and a plastic bag of marijuana. When asked to whom the drugs belonged, Whitehead said, “You know yоu got me, so don’t play.”
Joseph Crow, a supervisor of the Drug-Chemistry Section of the St. Louis Metropolitan Police Department’s Laboratory Division tested the substances seized from thе apartment and concluded that the total weight of all crack cocaine seized was 52.06 grams. 2 Additionally, he identified .91 grams of powder cocaine (cocaine hydroсhloride), 17.31 grams of marijuana, and 2.71 grams of heroin.
Upon Whitehead’s conviction for manufacturing with intent to distribute and possessing more than 50 grams of crack cocaine, the district court imposed a mandatory life imprisonment enhancement pursuant to 21 U.S.C. § 841 because Whitehead had previously been convicted of five felony drug offenses. Whitehead appeаls, arguing that (1) the mandatory minimum life sentence imposed constitutes cruel and unusual punishment, (2) the district court erroneously applied the enhanced sentence without a jury finding that the govеrnment had proved the existence of prior convictions beyond a reasonable doubt, (3) the enhancement was not justified because the government had not demonstrated that more than 50 grams of the cocaine was crack cocaine, and (4) the district court abused its discretion when it denied Whitehead’s motion for a continuance to retain new counsel. Whitehead also insisted that his counsel present an additional list of issues in his reply brief.
II. Analysis
A.
Whitehead urges us to apply the proportionality review established in
Solem v. Helm,
B.
We find similarly unavailing the contention that the district court violated Whitehead’s Sixth Amendment right to a jury trial by imposing an enhanced sentence based on his prior convictions without proving to a jury factual issues related to his criminal record. Evidence of a prior convictiоn need not be submitted to the jury for the enhancement to apply.
Collins,
C.
The district court did not abuse its discretion by denying Whitehead’s request for a continuance to obtain new counsel. The right tо choice of counsel is not absolute and is “circumscribed in several important respects.”
United States v. Gonzalez-Lopez,
— U.S.-,-,
D.
We review for clear error a district court’s identification of a controlled substance at sentencing.
Garrett v. United States, 211 F.3d
1075, 1076 (8th Cir.2000) (per curiam). We will reverse only if “left with a definite and firm conviction that a mistake has been made.”
Id.
(quoting
United States v. Brown,
Additionally, “[i]t is well established that ‘the identity of a controlled substance can ... be рroved by circumstantial evidence and opinion testimony.’ ”
United States v. Covington,
E.
Although we do not normally consider issues raised for the first time in a reply brief, the government has raised no objection to our addressing them. Having considered these newly raised arguments, we conclude that they are without merit.
The judgment is affirmed.
Notes
. The Honorable Jean C. Hamilton, United States District Judge for the Eastern District of Missouri.
. Crow analyzed the damp substаnce removed from the microwave and concluded that it was cocaine base (also known as crack cocaine). The cocaine in the microwave amоunted to 45.03 grams of the 52.06 gram total. During the time it was held as evidence, the damp cocaine dried into a single large chunk.
. Our conclusion is consistent with our prior observation that "Section 841 and its mandatory minimum sentencing provisions have consistently withstood constitutional scrutiny.”
United States v. Regenos,
