Police do everything they can to keep ethics violations from being measured. That is what the story is about. In light of that, your objection to psychometry's comment calling for oversight is quite absurd.
Your comments in this thread are recursively ridiculous and I'm not sure how far I want to unwind them, but people are "inventing their own narratives" (this is an astonishingly bad way of characterizing the problem here) in preference to siting hard numbers because the police are not holding themselves accountable, a phenomenon that includes the suppression of the hard data on how many abuses there are.
This is particularly tone deaf in light of the subject matter of the article. I can point to specific things that happened and say "that should not be permitted" or "this is evidence of a corrupt system that is not holding itself to account." I can do this before I know precisely how often it's happening, and it would be wrong not to do that.