From reading through some commentaries on the net I have found this comment that might be of consideration;

We don't know. But we do know that one school shooter after another was on prescription drugs. Kip Kinkel was taking Prozac. Columbine killer Eric Harris was taking Luvox. Red Lake Indian Reservation shooter Jeff Weise was taking Prozac. James Wilson, who shot 2 elementary school kids in Greenwood, South Carolina, was taking anti-depressants. Conyers, Georgia school shooter T.J. Solomon was on ritalin. Is this just a coincidence?

Again, we don't know. But here are some of the questions we need answers to:

1. It's been reported by the New York Times that Cho was on prescription medications. Which ones? Who prescribed them? How long had he been taking them?

And from my own recollection, the mother who drowned all her 5 children in the states, that garnered international attention with the story of the spider telling her to do it for God, was taking Wellbutrin.

Just how much control are we allowing the doctors and pharmaceutical companies and what liability are we allowing them to avoid.