1970—Pub. L. 91–579 inserted reference to instrumentalities of the United States which use animals for exhibition and added operators of auction sales subject to section 2142 of this title and licensed exhibitors to the enumeration of persons from whom United States Government facilities may acquire dogs or cats.

Amendment by Pub. L. 91–579 effective one year after Dec. 24, 1970, see section 23 of Pub. L. 91–579, set out as a note under section 2131 of this title.