I have been intermittently reporting on the NYPD for half a century—sometimes admiringly, as when I spent several weeks with a homicide squad on the Lower East Side, learning how (in contrast to the CIA's current methods) confessions that will hold up in court can be obtained by detectives without laying a hand on the suspect. And I've also written critically about the police, as well as various commissioners. But I have never seen such systematic dishonesty and contempt for the law as those documented in the 102-page report, "Marijuana Arrest Crusade: Racial Bias and Police Policy in New York...