Shawn;  I quite disagree.  The problem as I suspect you well know is the limiting number of characters for any reply.   Thus, one has to keep that in mind and not write 'books' here when a simple response will suffice.  As for my teachings done with the Mass. Institute of Forensic Pathology, they covered a span going back in time almost 5 decades.  The trends they showed pointed out exactly the point I was trying to make.  Anyone desiring to learn more can use the cite I gave and move forward as deep into the issue as they wish to go.  I first started my learning in this subject matter area around 1980 when I noticed a substantial increase in our police calls in this area but sadly noticed a lack of in-service in this subject matter area.  Fortunately, management was willing to invest individual training for me in this area with the idea that eventually I would train our officers.   I would not call myself an expert here, but do think I have more than average knowledge on this subject.