Well they will go all R. King on your ass.
Did you know a "Police Officer" can be proven to have murdered an unarmed someone who fled on foot and even after it has been proved that there was no way possible that the Officer would have the need to do that, the Cop still keeps his job he just goes on paid vacation.
In my hometown we have three officers in the past two years that have straight up killed someone not just in cold blood but execution style in the back of the head while they are on their knees, the best part all three officers are still working today.
Which is why we have an FBI precinct set up to investigate the officers. But they never do anything really.
Also we have a task for called U.N.I.T.E. that aren't public officials they are fucking civilians that will hold you against your will and search your person and hold you until an officer gets there on suspicion and then leave before you are unhand-cuffed.