Factual error: I seriously doubt that the DEA would recruit police within different police departments in the U.S. to work for them undercover. They have their own agents for that. Here Fishburne, a Cincinnati Patrolman, is asked to work Narcotics in L.A. for the DEA.
Factual error: In the bathroom scene when Fishburne shoots and kill James Morris. He uses a revolver with a silencer. Silencers don't work on revolvers as it does not cover the ammo cylinder.