How active shooters are changing school security in the US

Wonder which kill more students, poisonous insects, allergic reactions, or “active shooters”?

My daughter went to an elementary school surrounded by a 10 foot fence limiting access to only through the front office. While I was waiting in lobby, grandfather of one of the children started berating office staff because “anyone with an AK47 could walk right into the school”. I laughed out loud at him cause anyone with an AK47 can walk anywhere they damn want.

And this school was even better target because victims had no escape routes.