The "broken windows theory" of policing states, roughly, that if police focus on minor, low-level crimes like graffiti, vandalism other public order offenses, that focus helps deter and prevent more serious crimes.
It paid dividends last night when officers from an anti-crime unit stopped a red Chevy Impala for illegal window tint. When the driver could not produce the car's registration and/or insurance, he was asked to step out of the vehicle for more questioning. As he did so, an officer looking into the car saw a knife, opening up the car to a more detailed search. The result of that search? [Emphasis mine - K]
Here's the link.