officer adrian schoolcraft of the nypd recorded precinct roll call meetings each day. his fellow officers and superiors said that he did it because he was paranoid, and had schoolcraft involuntarily committed to a mental institution. the doctor that admitted him said that schoolcraft spoke about cover-ups and conspiracies at the precinct and that schoolcraft said that he was 'collecting evidence'.
when schoolcraft made the tapes public, it was learned that the nypd taught officers to arrest innocent pedestrians to hit quotas, and to change reports of crimes such as 'robbery at gunpoint' to 'lost property' in order to make crime in the city sound less bad than it was.