This is something I have kinda wondered about myself here. The sort of child I was, if anyone tried to "lockdown" a school, I'd find a way to leave anyway. I worry that now older, and when I become a parent.. How should/would a parent deal with a situation like this.
At any rate. Is it legal to do that? Hold you out of a public school from retrieving your own child? I don't have any kids yet, but really. I would have an extremely difficult time allowing my child to be in a dangerous lockdown situation. I'd want my child with me.