How Did This Slip Through?

Cho Seung-Hui was mentally ill and "an imminent threat to himself and others." Yet he managed to get two guns, which he then used to kill 32 people.

I don't blame the gun dealer, presuming he did the correct background check. The blame may lie with the Commonwealth of Virginia for not committing this madman or, at the very least, not warning those close to him of the threat this guy posessed. This didn't even show up on a background check. If ANYONE should be kept away from deadly weapons, it's someone who is THIS mentally-ill.

Someone's head will roll over this.