" But think back to those statistics from North Carolina. If you go from 400,000 traffic stops in one year to 800,000 seven years later, does that sound like focused and concentrated policing? Or does that sound like the North Carolina State Highway Patrol hired a lot more police officers and told everyone, everywhere, to pull over a lot more motorists? The lesson the law-enforcement community took from Kansas City was that preventive patrol worked if it was more aggressive. But the part they missed was that aggressive patrol was supposed to be confined to places where crime was concentrated. Kansas City had been a coupling experiment. "

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