39 U.S.C. § 1010
Officers and employees of the Postal Service performing duties related to the inspection of postal matters may administer oaths required or authorized by law or regulation with respect to any matter coming before them in the performance of their official duties.
(Pub. L. 91–375, , 84 Stat. 733.)
Section effective , pursuant to Resolution No. 71–9 of the Board of Governors. See section 15(a) of Pub. L. 91–375, set out as a note preceding section 101 of this title.