A police officer kills a twelveyearold boy. Its caught on video. The officer gets off. A police officer strangles a man selling cigarettes. Its caught on video. The officer gets off. A police officer shoots a man in his car. Its livestreamed. The officer gets off. It happens over and over again. The culprit here alongside the cops is Qualified Immunity QI a legal principle which Reuters describes as a nearly failsafe tool to let police brutality go unpunished and deny victims their constit