Affirmed by published opinion. Judge WILLIAMS wrote the opinion, in which Judge LUTTIG and Judge TRAXLER joined.
OPINION
John L. Houston Brower appeals his conviction for knowingly and intentionally distributing more than 50 grams of a substance containing cocaine base. Brower argues that the district court erred by instructing the jury that the Government did not have to prove that he knew the exact nature of the substance he distributed. For the reasons set forth below, we affirm.
I.
On January 29, 2002, a federal grand jury in the United States District Court for the Middle District of North Carolina indicted Brower for knowingly and intentionally distributing 68.8 grams of a substance containing a detectable amount of cocaine base in violation of 21 U.S.C.A. § 841(a)(1) (West 1999). Brower pleaded not guilty and was tried by a jury. After the close of evidence, the district court, over Brower’s objections, instructed the jury that
[although the Government must prove the Defendant knew he distributed a controlled substance, the Government does not have to prove the Defendant knew the actual nature of the substance he distributed. It is enough that the Government proves the Defendant knew *276 he distributed some kind of controlled substance.
(J.A. at 163-64.)
On April 9, 2002, Brower was found guilty of distributing more than 50 grams of a substance containing a detectable amount of cocaine base. On June 21, 2002, Brower was sentenced to life in prison under 21 U.S.C.A. § 841(b)(l)(A)(iii). Brower filed a timely notice of appeal.
II.
We consider de novo whether a jury was properly instructed on the statutory elements of an offense.
United States v. Horton,
We held, prior to
Apprendi,
that “[i]n order to secure a conviction under [§ 841(a)(1) ] the government must prove beyond a reasonable doubt that (1) defendant knowingly or intentionally distributed the controlled substance alleged in the indictment, and (2) at the time of such distribution the defendant knew that the substance distributed was a controlled substance under the law.”
United States v. Tran Trong Cuong,
The issue, then, is whether
Apprendi
changed the Government’s mens rea burden with regard to the particular controlled substance involved in the offense. The Government’s mens rea burden is defined under § 841(a), which makes it an offense to “knowingly or intentionally” distribute a controlled substance. The Court in
Apprendi
held that “any fact that increases the penalty for a crime beyond the prescribed statutory maximum must be submitted to a jury, and proved beyond a reasonable doubt.” 530 U.S. at
*277
490,
III.
For the foregoing reasons, we affirm Brower’s conviction for knowingly and intentionally distributing more than 50 grams of a sub-stance containing cocaine base.
■AFFIRMED
Notes
. Brower, however, insists that this court’s case law in fact requires the government to prove that a defendant knew which controlled substance he was distributing. In support of this argument, Brower points to
United States v. Burgos,
. For the first time in his reply brief, Brower raises a claim regarding the consistency of the jury instructions. Because it was not included in his opening brief, we consider it waived.
See Carter v. Lee,
