[Terretta]

In the U.S., “the Fourth Amendment permits the warrantless searching of mail entering or leaving the United States…. Congress specifically has authorized the warrantless search of mail at the border, although some of those provisions place restrictions on the reading of correspondence. See, e.g., 19 U.S.C. § 1583(a)(l) (permitting warrantless search of mail of domestic origin transmitted for export … and foreign mail transiting the United States”)…”