Martin Kaste

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DAVID GREENE, HOST:

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Any American who pays attention to law enforcement has heard of the strategies: "broken windows," "stop and frisk," "zero tolerance." These are all variations on what's broadly known as "proactive policing": efforts to seek out and prevent the causes of crime before it happens, as opposed to a more reactive policy of just sending police when called.

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ROBERT SIEGEL, HOST:

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MARY LOUISE KELLY, HOST:

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