The rarified federal rules that protect police involved in shooting citizens. Negligence or possible use-of-force alternatives to killing are not controlling. Lying helps some. Prosecutorial misconduct runs rampant.
Read this Washington Post piece by Radley Balko about how, from the top down, law enforcement, in nearly every instance, protects its “own” in cases of police shootings. The absurd logic, failures to investigate and lies are shown in “How Jeff Sessions will enable more Michael Slagers.”