Do widespread brain toxins explain violence rates?
There is some truth to this. I don't have the time to go into details but I've found an interesting link..

https://books.google.ch/books?hl=en&amp;lr=&amp;id=5lMP9ivOoxcC&amp;oi=fnd&amp;pg=PA11&amp;dq=environmental+toxins+violence+rate&amp;ots=SKB0rFeBnA&amp;sig=w4g2Ne5JfwT0v36m5gFwPbqJCRw#v=onepage&amp;q=environmental%20toxins%20violence%20rate&amp;f=false