District 21 of the Chicago Police Department is made up of two distinctly different groups. There are the uniformed cops who patrol the beat and go head-to-head with the city's street crimes. And there's the Intelligence Unit, the team that combats the city's major offenses - organized crime, drug trafficking, high profile murders and beyond.
Did You Know?
COH is short for Confidential Overhear. See more
Police officers consistently say a person was DOA which stands for Dead On Arrival (at a hospital) when the person is found dead at the scene of a crime. What they should say is DOS which stands for Dead On Scene. See more