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"Ever since Columbine, lockdown on schools or large institutions following a shooting (especially when the gunman is loose) is standard operating procedure."
I have no idea how a "lockdown" could even be implemented at the college where I teach, which is about a tenth of the size of Virginia Tech. I would really appreciate evidence to support the above statement. I would also really appreciate a basic idea of how the logistics of a "lockdown" are supposed to happen on a large campus. Thank you.