From cops who are paragons of virtue, to cops who are as bad as the bad guys...from surly loners, to upbeat partners...from detectives who pursue painstaking investigation, to loose cannons who just want to kick down the door, the heroes and anti-heroes of TV police dramas are part of who we are. They enter our living rooms and tell us tall tales about the social contract that exists between the citizen and the police. Love them or loathe them--according to the ratings, we love them--they serve a function. They've entertained, informed and sometimes infuriated audiences for more than 60...