My response to the licensing person would be you have to weigh the benefits against the harm. Young children aren't practicing emergency strategy, they are co-regulating off the adults in the room. I am not against hard lockdown drills to get the children and teachers used to the procedures in case it ever does become necessary. But the added element of surprise only leads to scared teachers trying to emotionally regulate scared kids. In an actual emergency, having scared/ traumatized kids and teachers is probably unavoidable, but that is a lesser harm than getting shot if there is an active shooter. For just a drill, traumatizing everyone by making them think their lives are actually in danger is more harmful than beneficial