I have never heard, ever, of an active shooter drill where part of the drill is the sound of gunfire. Where did you hear that was the case?
Do you have a credible link for that please? Not saying I don’t believe you, but I don’t believe they would do that, ever. I could. be wrong, but I will be stunned if I am.
Parkland high school Multiple shooters confirmed Contains eyewitness account of multiple shooters and the ACTIVE SHOOTER DRILL.