KMA-367 was the official Federal Communications Commission (FCC) call sign for Los Angeles Police Department radio transmitters from 1948 through the 1980s. Those driving around with these license plate holders are associated with the LAPD.
Ya...Known that since I was in grade school...
Trust me, there are those who belong who’d never be so stupid as to display that. Not all bad guys are stupid...
BTW, there are newer assigned calls signs for other division frequencies, but are still a dead give away for those who know.