A former behavioral aide at Switzer, who did not want her name used, said the majority of the students at the school are from foster, low-income and single-parent homes. Some of these students were expelled from other schools or had been in trouble with the law.
Read morehttp://www.dailybreeze.com/general-news/20151001/oregon-gunman-chris-harper-mercer-lived-in-torrance-graduated-from-switzer-center
Teens with emotional disabilities = psychotropic drugs
Learning disabilities and emotional issues = psychiatric drugs
Another Mass Shooting, Another Psychiatric Drug? Federal Investigation Long Overdue http://www.cchrint.org/2012/07/20/the-a ... opic-drug/

Every time I see one of these shootings reported on the news it doesn't take many mouse clicks to discover the shooter was exposed to the mental health system and that usually means psychiatric drugs.