If it's just s.o.p. for cops, then something is very wrong.
I've written a few times that once upon a time the great myth of the 80s/90s cop drama was the all powerful Internal Affairs. Sometimes IA were the good guys, nailing corrupt cops. Sometimes they were the bad guys, stopping cops who did what needed to be done to stop the bad guys. But whatever the storyline, Internal Affairs was SUPER POWERFUL. They would destroy your life and career as a cop if they got into your shit.