Anyone ever run or been in a game where the PCs are all beat or patrol cops?

Started a campaign where the PCs are stationed in the Little Italy precinct. Have some ideas about hooks
>the mob is going through an internal power struggle. Old vs New/Tradition vs Change
>a corporation being the source of a new drug, being distributed through groups of dorphs
>cybered-up psycho crack head being a constant nuisance, running around robbing people, pulling out copper wire and components for his fix
>group of skater teens graffitiing their "art"

Got any stories about good or bad cop campaigns?