Pittsburgh had a cop who couldn't stop shooting people and costing the city money through wrongful death lawsuits. He even left a bar completely shitfaced and pistolwhipped a random passerby and shot him over some sort of phantom disrespect, and no action was taken.
 
https://archive.triblive.com/news/city-officer-charged-in-south-side-street-shooting/
https://www.post-gazette.com/local/city/2009/06/12/Officer-cleared-in-off-duty-assault-on-South-Side/stories/200906120177

 
They finally got rid of him in 2021. 13 years after the incident in that story.