Section
50, acts Aug. 24, 1912, ch. 355, § 8,
37 Stat. 487; June 6, 1939, ch. 185,
53 Stat. 810, authorized collectors of customs to administer oaths to expense accounts.
Section
51, act Mar. 4, 1923, ch. 251, § 7,
42 Stat. 1454, provided limitations on compensation.