the United States Government

“ Seizing and detaining letters An officer or employee of the Postal Service performing duties related to the inspection of postal matters, a customs officer, or United States marshal or his deputy, may seize at any time, letters and bags, packets, or parcels containing letters which are being carried contrary to law on board any vessel or on any post road. ”

“ The same proceedings may be used to enforce forfeitures as are authorized in respect of goods, wares, and merchandise forfeited for violation of the revenue laws. Laws for the benefit and protection of customs officers making seizures for violating revenue laws apply to officers and employees making seizures for violating the postal laws. ”