Private express statute refers to set of civil and criminal federal laws restricting the carriage of posts and letters by all organizations other than the U.S. Postal Service. (USPS). The U.S. Government created private express statute for the best interest of general public. However, the U.S. postal service (USPS) can suspend private express statute if it believes private postal service benefits the public.
Private express statute is codified under the federal statute, 18 USCS § 1693 whereby it states that whoever, being concerned in carrying the mail, collects, receives, or carries any letter or packet, contrary to law, will be fined or imprisoned not more than thirty days, or both.