In this Feb. 16, 2017 photo, Minneapolis Police Officer Justin Churchill steps in his vehicle in Minneapolis. Churchill uses his body camera while on patrol in the third precinct. When a Minneapolis police officer shot and killed Justine Damond, who had called in a possible crime in the alley behind her house on July 15, his body camera wasn't running. Criminal-justice experts say the early numbers suggest that officers aren't turning them on often enough, and Minneapolis isn't the only city where that's the case. (Glen Stubbe/Star Tribune via AP)
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