; and (2) during the 3 fiscal years that first begin after the date of the enactment of this Act, prioritize for compliance inspections those firearms dealers that have not been inspected within the then preceding fiscal year with a high number of crime gun traces relative to other firearms dealers. 5. Mens rea requirement for violations of rules applicable to only licensees Section 924(a)(1)(D) of title 18, United States Code, is amended by striking willfully and inserting knowingly . 6. Firearms trafficking offense (a) In general Section 933 of title 18, United States Code, is amended to read as follows: 933. Trafficking in firearms (a) Prohibitions (1) In general It shall be unlawful for any person to— (A) ship, transport, transfer, cause to be transported, or otherwise dispose of 2 or more firearms to another person in or affecting interstate or foreign commerce, if the person knows or has reasonable cause to believe that the use, carrying, or possession of a firearm by such other person would constitute a felony (as defined in section 932(a)); (B) receive from another person 2 or more firearms in or affecting interstate or foreign commerce, if the person knows or has reasonable cause to believe that the receipt would constitute a felony; or (C) attempt or conspire to commit conduct described in paragraph (1) or (2). (2) Licensees It shall be unlawful for any licensee to ship, transport, transfer, cause to be transported, or otherwise dispose of any firearm to another licensee if the licensee knows or has reasonable cause to believe that— (A) in the preceding year, 5 or more firearms that were used in a crime under Federal, State, or local law within 3 years after the last known retail sale of the firearms have been traced to such other licensee; (B) in the preceding year, to the knowledge of the licensee, such other licensee has since failed to implement or update business practices to prevent firearm trafficking or straw purchasing