About par for police accountability in America.
If they fuck up or even murder you, there's always some legal gobbldygook that they'll use to exhonorate themselves. Since 'Murikans are trained since about birth to obey massah and especially obey a lawyer, they bop their heads, say yassuh boss and get back to sports or shows.
Even IF there's a trial, they run that. Your defense attorney? Same team. It's Calvinball people and you don't get to make the rules.
IF, IF, there's a verdict in a courtroom, guess what, they're insured and it won't cost the dept. a dime. More than likely the perp cop will have had not only a nice vacation but probably added a back deck or swimming pool or had a real good time with some hookers and blow.