§ 2138. Purchase of dogs or cats by United States Government facilities prohibited except from authorized operators of auction sales and licensed dealers or exhibitors

No department, agency, or instrumentality of the United States which uses animals for research or experimentation or exhibition shall purchase or otherwise acquire any dog or cat for such purposes from any person except an operator of an auction sale subject to section 2142 of this title or a person holding a valid license as a dealer or exhibitor issued by the Secretary pursuant to this chapter unless such person is exempted from obtaining such license under section 2133 of this title .