I can't find the post now but somewhere in this thread somebody posted an article that said a teacher propped the door open minutes before the perp entered.
I'd be waterboarding that individual until I was positive this wasn't planned by more people than the shooter.
Water board away, that person deserves it, but the most likely reason is it was lunchtime and the teacher the school Cop apprehended when he was looking for the shooter was the one who had just propped the door open while he went out to his car.
