" When Larry Sherman designed the Kansas City gun experiment, he was well aware of this problem. “You wouldn’t tell doctors to go out and start cutting people up to see if they’ve got bad gallbladders,” Sherman says. “You need to do lots of diagnosis first before you do any kind of dangerous procedure. And stop-and-search is a dangerous procedure. It can generate hostility to the police.” To Sherman, medicine’s Hippocratic oath—“First, do no harm”—applies equally to law enforcement. "

― Malcolm Gladwell , Talking to Strangers: What We Should Know About the People We Don’t Know