Phoenix's police union has a secret deal with the department to purge dirty cops' disciplinary records

They have incredible PR, the ability to tweak the crime stats and tank any mayor’s reelection campaign, they act in unison, and when someone overcomes all of that, they aren’t at all shy about rioting. https://www.nytimes.com/1992/09/17/nyregion/officers-rally-and-dinkins-is-their-target.html