; and (B) to deliver or receive for the purpose of movement, conveyance, carriage, or shipment. 5. Prohibited acts (a) In general Except as provided in subsection (b), it shall be unlawful for a person to knowingly— (1) import into, or export from, the United States bear viscera or any product, item, or substance containing, or labeled or advertised as containing, bear viscera; or (2) sell or barter, offer to sell or barter, purchase, possess, transport, deliver, or receive, in interstate or foreign commerce, bear viscera or any product, item, or substance containing, or labeled or advertised as containing, bear viscera. (b) Exception for wildlife law enforcement purposes A person described in section 4(4)(B) may import into, or export from, the United States, or transport between States, bear viscera or any product, item, or substance containing, or labeled or advertised as containing, bear viscera if the importation, exportation, or transportation— (1) is solely for purposes of enforcing laws relating to the protection of wildlife