Wanted to point you in the direction of a recently released book that was a very educational and an excellent read.
If you have any interest in some understanding of Columbine and all mass shootings, mass violence incidents I would highly recommend this book for a variety of reasons.
http://www.davecullen.com/
I suggest this book for anyone involved in emergency planning, school safety, threat assessments, law enforcement, etc.
http://www.davecullen.com/
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