Robb, I can tell you without reservation that there is NO appropriate screening instrument for your purpose. Part of my clinical practice is "threat assessment", and I often evaluate even certified law enforcement officers to determine if they should remain armed.<br><br>There are probably sources which will sell such screening instruments to you. I'll argue (I've testified to the fact) that while this may make you feel better, there is no scientific basis for the concept of simple screening in this context. On the other hand, even with the best.. most complex.. and professional psychological evaluation available, you better your odds minimally over a toss of a coin in most circumstances.<br><br>A complex question.