The 'Are they punished?' question is probably the huge part. In my experience here, cops get off pretty easy for anything and if they even are punished - they still keep their job. G20 had huge issues with cops' hard man fantasies getting the best of them - roughing up reporters, people just sitting around and nothing is done to any of them as the investigating branch can never find anything, etc. People are surprised in fact a cop got sentenced to 15 months for forcing a lady to give him oral sex (kind of light, really) , but the funny bit is he might not lose his job.
Generally, you get a sense of a law for them and a law for us. Or like Bryant's quote in Blade Runner, 'if you're not cop, you're little people'.