The environs may be flashy, but murder is still murder -- something forensic detective Horatio Caine (David Caruso) never lets his team forget in this popular CBS crime drama, especially when Caine becomes the target of his own unit's investigation. A mole infiltrates the CSI operation; the feds stick their noses in; and the Mala Noche gang returns in the fourth season of this cop show co-starring Emily Procter, Adam Rodriguez and Khandi Alexander.