19 CFR 162.6: Search of persons, baggage, and merchandise.

All persons, baggage, and merchandise arriving in the Customs territory of the United States from places outside thereof are liable to inspection and search by a Customs officer. Port directors and special agents in charge are authorized to cause inspection, examination, and search to be made under section 467, Tariff Act of 1930, as amended (19 U.S.C. 1467), of persons, baggage, or merchandise, even though such persons, baggage, or merchandise were inspected, examined, searched, or taken on board the vessel at another port or place in the United States or the Virgin Islands, if such action is deemed necessary or appropriate.