§ 2141.
All animals delivered for transportation, transported, purchased, or sold, in commerce, by a dealer or exhibitor shall be marked or identified at such time and in such humane manner as the Secretary may prescribe: Provided, That only live dogs and cats need be so marked or identified by a research facility.
([Pub. L. 89–544, § 11], Aug. 24, 1966, [80 Stat. 351]; [Pub. L. 91–579, § 12], Dec. 24, 1970, [84 Stat. 1562]; [Pub. L. 94–279, § 5], Apr. 22, 1976, [90 Stat. 418].)