Footage of live drill at Parkland School aired by NBC

I heard news coverage on the day of the shooting which referred to a drill going on the day of the shooting but I have not seen this footage before.

You Tube won’t want any of this material to see the light of day so I have saved it.

This is the clearest example of a false flag I have seen. Students at the school will have thought nothing of the real shooter active in the school (reportedly dressed in police black) while the cops were stood down for long enough for a massacre to take place

Parkland Florida Students Rehearsal Before The Fake Shooting - Aired By NBC