The Mod Squad (movie, 1999)

Three minor delinquints (Danes, Ribisi, and Epps) are recruited by a cop (Farina) working undercover to bust a cop/drug ring. When the officer who recruited them is killed, they go above and beyond the call of duty to solve the murder; and bust the drug ring. Suffering the jibes, and ridicule of fellow officers; they struggle to save their names, and that of their deceased benefactor.