Police and FBI Acronyms, Codes and Terminology Used In the Books 187 California Penal Code for Murder 187 LEO California Penal Code for Murder of a Law Enforcement Officer 3056 California Penal Code for Parole Hold 5150 California Penal Code for Mentally Unstable 51 Reports Citizen Complaint Files 51s Investigative Chronology reports ACU Asian Crimes Unit … Continue reading Police & FBI Acronyms