I bought Mass Killers: How you can identify workplace, school, or public killers before they strike (Amazon affiliate link) in December of 2013. I think started to read it, and lost interest / had other things come up. I recently picked this book up to read not that long ago, and went through it. Mike Roche, did a good job of breaking the book up in to parts. He uses his history in Law Enforcement to cover Mass Shootings, the signs, and how HR / Senior Leadership should handle the events leading up to a shooting.

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