I ran into this on Drudge and out of curiosity watched the video on what to do in an active shooter situation. The article claims it was produced by the city of Houston.
There's a very quick shot of the "active shooter" entering the building through a very prominently marked door.
Ray F.
Luke 22:35-38 "Gear up boys, I gotta go and it's gonna get rough." JC
-- Darrell Royal, former UT football coach - "If worms carried pistols, birds wouldn't eat 'em."