High-definition video cameras with 30x magnification keep watch over the Boston Marathon finish line, where two bombs detonated in 2013, killing three people and injuring hundreds. Jesse Costa/WBUR hide caption

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Jesse Costa/WBUR

Boston Marathon Surveillance Raises Privacy Concerns Long After Bombing

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Micaela Torres and 2-year-old Jakai Johnson swing underneath a surveillance camera at Miwok Park in Elk Grove, Calif. The city's police department collects more than 100 video feeds from across the city. Steve Henn/NPR hide caption

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In More Cities, A Camera On Every Corner, Park And Sidewalk

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