detroit police
The dirtiest, most crooked cops you will find. They are always portrayed as dirtbags and lowlifes in movies. Many people believe they will let you off the hook if the crime is anything short of murder.
Do you want to hear a joke? The entire detroit police department! They pulled me over and I had 50 kilos of coke, and they let me off as long as I did 4 lines in front of them!