19 CFR § 162.62 - Permissible controlled substances on vessels, aircraft, and individuals.
Upon compliance with the provisions of the Controlled Substances Act (84 Stat. 1242; 21 U.S.C. 801), the Controlled Substances Import and Export Act (84 Stat. 1285; 21 U.S.C. 951), and the regulations of the Drug Enforcement Administration (21 CFR 1301.28, 1311.27), controlled substances listed in schedules I through V of the Controlled Substances Act may be held:
(a) On vessels engaged in international trade in medicine chests and dispensaries.
(b) In aircraft operated by an air carrier under a certificate or permit issued by the Federal Aviation Administration for stocking in medicine chests and first aid packets.
(c) By an individual where lawfully obtained for personal medical use or for administration to an animal accompanying him to enter or depart the United States.