Code of Federal Regulations Title 31. Money and Finance–Treasury § 31.515.207 Entry of vessels engaged in trade with Cuba

(a) No vessel that enters a port or place in Cuba to engage in the trade of goods or the purchase or provision of services, may enter a U.S. port for the purpose of loading or unloading freight for a period of 180 days from the date the vessel departed from a port or place in Cuba;  and

(b) No vessel carrying goods or passengers to or from Cuba or carrying goods in which Cuba or a Cuban national has an interest may enter a U.S. port with such goods or passengers on board.