If you've ever seen Law and Order, you know the basic set up of the game:
First half of the show is devoted to the cops and the second half to the lawyers. Anytime you see a lawyer in the cop half or cop in the lawyer half...drink! Every so often a black screen will pop up showing the time and location. See that and drink! Anytime someone is read the Miranda Rights ("you have the right to remain silent...yadda yadda yadda") -- drink!
This last rule is the kicker: Every episode has a victim. Whenever the victim's name is said...drink! This can get ugly especially if the victim is a child and has a hysterical mother.