Lead was a major contributing factor. http://www.forbes.com/sites/alexknapp/2013/01/03/how-lead-caused-americas-violent-crime-epidemic/ http://www.forbes.com/s

Lead was a major contributing factor. http://www.forbes.com/sites/alexknapp/2013/01/03/how-lead-caused-americas-violent-crime-epidemic/ http://www.forbes.com/sites/alexknapp/2013/01/03/how-lead-ca...