This has been done before in the Shield, but this film takes things up to another level. Cuba Gooding Jr.'s character is deeply unpleasant, but deeply unpleasant people do exist, otherwise there would be no evil in the world.
Clifton Collins Jr was terrific, playing a man going through a breakdown, disgusted by what he had done and what he had become and seeking redemption in a terrible way - by betraying his partner. The agony on his face, the ghosts that haunted him, the futile attempts to put a limit on the things his partner wanted to do made this a brilliant performance
The film was chaotic, held together only by its timeframe - 8am to 6pm, but that was symbolic of the lives of the two men and the other corrupt cops. Nothing made sense any more because the lines between good and evil and right and wrong had become totally non existent.
If you like The Shield, The Wire, or Homicide Life on the Streets, you'll like this.