Virginia Tech Killer and Prescription Drugs

[enquirewithin]

Reading about this tragedy this caught my eye:

Prescription medications said to be related to treatment of psychological problems were found among Mr. Cho’s effects, but officials did not specify what drugs they were.

New York Times

The New York Times also reported that prescription drugs used to treat psychological disorders were found among his effects. Almost every perpetrator of a mass shooting in the United States in recent years had either been on prescription drugs or had stopped taking them shortly before erupting in violence.

The Independent

Intersting. I have read about SSRIs, for example, causing psychotic reactions in users-- or is it just that people likely to become killers will tend to seek medicatation?