7 U.S.C. § 285

Funds appropriated to carry out the provisions of this chapter may also be used for printing and binding without regard to section 501 of title 44 for employment, by contract or otherwise, of civilian nationals of Canada, Mexico, Guatemala, Belize, Honduras, El Salvador, Nicaragua, Costa Rica, Panama, and Colombia for services abroad, and for the construction and operation of research laboratories, quarantine stations, and other buildings and facilities.