I wonder about this concept of "lock-down". What does that mean? The students are not permitted to leave the school or even their classrooms? I guess I can understand this in the case of elementary schools but universities? Even high schools. I remember in H.S. if the wave report was good there was a parade of cars leaving at 2:00. If somebody had told me I was not allowed to leave, that would have been kidnapping or unlawful imprisonment or something. Dammit I can leave whenever I like. If they want to charge me with truancy that´s their decision but they cannot force me to remain somewhere when I choose to leave.