39 U.S.C. § 605 - U.S. Code - Unannotated Title 39. Postal Service § 605. Searching vessels for letters

An officer or employee of the Postal Service performing duties related to the inspection of postal matters, when instructed by the Postal Service to make examinations and seizures, and any customs officer without special instructions shall search vessels for letters which may be on board, or which may have been conveyed contrary to law.