19 CFR 12.36 : Customs Duties (§ 0.1 To Parts 400-599) — (§ 0.1 To Parts 135-140) — U.S. Customs And Border Protection, Department Of Homeland Security; Department Of The Treasury (§ 0.1 To Parts 135-140) — Special Classes Of Merchandise (§ 12.1 To § 12.152) — Narcotic Drugs (§ 12.36) — Regulations of Bureau of Narcotics.

The importation and exportation of narcotic drugs are governed by regulations of the Drug Enforcement Administration Bureau of Narcotics. Customs officers and employees shall perform all duties imposed upon them by such regulations and the laws under which they are issued. Such regulations are in addition to, and not in lieu of, the Customs, internal-revenue, and other pertinent laws and regulations.