Well they DID show a female cop in one of the official posters so I think it's likely that they'll be in the game to some degree... But thats just speculation. I still expect the vast majority of cops to be male though
(PSN: MShogunH) Naruto Shippuden Ultimate Ninja Storm 3, Grand Theft Auto V, God of War: Ascension, Skyrim DLC!!!
In San Andreas, in the upper section of the map, just west of your air strip and north of the hoover dam area. You meet a female cop, AND date her. Once she is you girlfriend above a certain percentage you got to keep your weapons when "busted".