Also, many parents were on scene within minutes of the reverse 911 call. I doubt a small "everyone must sign in here" sign prevented many from simply taking their child and getting the hell out of there. I certainly would have. I would not have stuck around a scene that was obviously still too hot for ambulances to be allowed entry; the firehouse is not that far from the school. SWAT teams were running around with dogs and yelling and acting as if an entire army of shooters was still on the loose. I would have gotten my kid home, sign or no sign.