How Israel and Thailand are preventing Jihadi shootings
The Volokh Conspiracy
July 29, 2006
http://volokh.com/archives/archive_2006_07_23-2006_07_29.shtml#1154195719

“At schools and other youth centers, they allow or require the presence of armed adults, such as teachers, as I detailed in a 2004 article for National Review Online.”

The Second Amendment IS Homeland Security !