 Postal Inspectors enforce over 200 federal laws providing for the protection of mail in investigations of crimes that may adversely affect or fraudulently use the U.S. Mail, the postal system or postal employees.The USPIS has the power to enforce the USPS monopoly by conducting search and seizure raids on entities they suspect of sending non-urgent mail through overnight delivery competitors.According to the American Enterprise Institute, a private conservative think tank, the USPIS raided Equifax offices in 1993 to ascertain if the mail they were sending through Federal Express was truly "extremely urgent".