Court TV via AP When a jury found former Minneapolis police officer Derek Chauvin guilty of murdering George Floyd, it did something very unusual. The reality in America today is it’s notoriously difficult to prosecute police officers for killings — less than 2 percent of fatal shootings are ever prosecuted for murder or manslaughter, and even fewer are convicted. That difficulty begins with the immediate aftermath of a police officer killing someone: The event is investigated by the police themselves, who have very different incentives than they do during a typical criminal investigation. You can probably conjure up images of a crime scene from shows like