See photos: Active school shooter drill
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Winston: EMS personnel arrive on the scene during an active shooter training exercise held by the Douglas County Sheriff's Office at Mason Creek Middle School on Wednesday, July 25, 2018, in Winston. The large-scale training drill is meant to test the resources of area law enforcement and emergency responders in an effort to better prepare Douglas County First Responders in the event of a mass casualty active shooter event. Curtis Compton/ccompton@ajc.com