The government prosecutes the government and is judged by the government and a jury screened under voir dire by two government lawyers?

Kind of like when a robber comes to your house, you have him arrested, and when you go to court you look up and he is the one swinging the gavel.

Of course, interesting the cop has to know there is a constitution violation. Somehow ignorance of the law is always an excuse for the cops but the citizenry must know all 190,000 pages of federal regulations and 300,000+ laws and by god if they forgot one they are fucked.