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December 19, 2014

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Boston Police Officer John Quinn walks with, Miller, his bomb-detection canine, over the finish line while sweeping the area in preparation for the Boston Marathon, Wednesday, April 16, 2014.

Charles Krupa / AP

Boston Police Officer John Quinn walks with, Miller, his bomb-detection canine, over the finish line while sweeping the area in preparation for the Boston Marathon, Wednesday, April 16, 2014.