Juan Manuel Guevara appeals his guilty-plea conviction for possession of more than 50 kilograms of marijuana with intent to distribute. Guevara argues that his conviction should be reversed because 21 U.S.C. § 841 is unconstitutional under Apprendi v. New Jersey, 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000). This issue is foreclosed, as Guevara concedes, by United States v. Slaughter, 238 F.3d 580, 582 (5th Cir. 2000). Guevara’s conviction is AFFIRMED.