5 U.S.C. § 5706b
Interview expenses
An individual being considered for employment by an agency may be paid travel or transportation expenses under this subchapter for travel to and from pre-employment interviews determined necessary by the agency.
(Added Pub. L. 101–509, title V, § 529 [title II, § 206(a)(1)] , Nov. 5, 1990 , 104 Stat. 1427 , 1457.)