My sister's boyfriend was killed by a police officer who was drunk. The other cops arrived and tried to keep him from taking a breathalyzer because they knew it would bee way too high. The state troopers arrived and pushed them out of the way to have it done. Even with trying to wait it out he was way over the limit. If the state troopers didn't intervene the local cops would have made sure the guy was under the limit before he got tested.

It took years for my sister to finally get a day in court because the local cops tried so hard to "protect their own" from charges. And the final result was just a slap on the wrist.