Continuity mistake: At the very end, as the S.W.A.T. truck pulls away and is driving through the desert after dropping off the prisoner, a call comes through the radio. Street puts his ear-piece on, the camera angle changes to Hondo who is right behind and replying to Street, and Street is again just beginning to put his ear-piece on.
Continuity mistake: When Gamble and TJ exit from the sewer, a member of the gang puts the lock on the gate between the bars on the door and the gate at an angle. When Street and Hondo arrive and try to shoot the lock off, it's on the latch holes and the lock is straight.
Chosen answer: Because he was offered a lot of money. $100 million is a lot of money to turn down for someone on a policeman's salary.
LorgSkyegon