Ex parte Jackson, 96 U.S. 727 (1878), was a United States Supreme Court ex parte decision.^[1] The case decided that the United States Post Office may open and inspect mail to limit the transmission of circulars on lotteries.^[2] It also extended Fourth Amendment protections to private letters, holding that letters and sealed packages sent through the mail required warrants to be searched through.^[1]

Ex parte Jackson
Supreme Court of the United States
Decided October 1, 1878
Full case name	Ex parte Jackson
Citations	96 U.S. 727 (more) 6 Otto 727; 24 L. Ed. 877
Court membership
Chief Justice Morrison Waite Associate Justices Nathan Clifford · Noah H. Swayne Samuel F. Miller · Stephen J. Field William Strong · Joseph P. Bradley Ward Hunt · John M. Harlan
Case opinion
Majority	Field, joined by unanimous