In 1999 someone I knew back then, who was aware of what psych drugs do to people, spent a week in a library going through newspapers and randomly picked out hundreds of shootings from a period of 10 years or more. In 100% of the cases every individual that was apprehended for the shooting had been either: a) given psychiatric drugs just before the shooting, or b) had recently been to see a psychiatrist. Back then I had the pdf of all the cases he looked at but that info is sitting on a computer in Ilinois which is in storage.
None of the shootings were done by 'normal' people i.e. those who had never been on psych drugs or who had never been to see a psychiatrist.
This friend tried to get media companies to cover the story but they all refused.