Dist. Ct. did not err in denying defendant’s motion to rescind special condition of supervised release authorizing warrantless searches of his person and residence as part of sentence on his conviction for certain drug offenses. Ct. found that defendant could raise such substantive challenge under 18 USC section 3583(e)(2), but rejected defendant’s argument that such condition was inappropriate for drug offenders. Moreover, such condition was appropriate, where defendant had previously been discovered using drugs in violation of condition of supervised release prohibiting such use. Also, defendant waived any error with respect to Dist. Ct.’s imposition of 13 standard conditions of supervised release, where defendant had failed to raise such claim in District Ct.