Sounds like we need a Government agency whose sole job is to drop in unexpectedly on other Governmental agencies to check them for the legality of their operations. Imagine a Federal SWAT suddenly dropping in on your local police or sheriff's department, all in full body armor, carrying assault rifles, and not answering questions. Imagine a DPS highway patrol car that had just stopped a motorist for speeding, suddenly being surrounded by the Federal SWAT, who cuff the officer, and make him sit on the side of the road for an hour while they inspect his vehicle for safety and other issues... while they send the motorist on his way because they are too busy with the cop to be interrupted by a motorist.