To provide that a person may use a private express for the private carriage of certain letters and packets without being penalized by the Postal Service, and for other purposes.

Prohibits the U.S. Postal Service or the Attorney General from fining or otherwise penalizing any person who transmits by private express or other unlawful means, delivers to any agent thereof, or deposits at any appointed place any letter or packet.

Amends the Federal criminal code to conform with this Act.

Prohibits the U.S. Postal Service from authorizing any officer or employee to make searches of mail matter transported in violation of law in any store or office of a customer of a common carrier or transportation company.