 Under the Mail Cover Program USPS photographs the front and back of every piece of U.S. mail as part of the sorting process, enabling law enforcement to obtain address information and images of the outsides of mail as part of an investigation without the need for a warrant.The United States Postal Inspection Service (USPIS) is one of the oldest law enforcement agencies in the U.S.Founded by Benjamin Franklin in 1737, its mission is to protect the Postal Service, its employees, and its customers from crime and protect the nation's mail system from criminal misuse.