Adult oriented cop show on FX, heading for its 7th and final season, stars Michael Chiklis as the head of an LAPD anti-gang unit called Strike Team. Thing is, Vic Mackey, Chiklis' character, is also dirty as Hell, i.e. shooting his partner (played by Reed Diamond from Homicide) dead when he was going to turn him over to the Feds in the pilot episode, as well as other antics as heisting the Armenian mob for half a mil.

Probably my favorite drama show outside of Doctor Who.