To their credit, ours has done just that. Admitedly, it's a special case where it's hard to argue how it's even remotely possible to prevent it from happening. A guy who has no criminal record, bought all his ingredients legaly, and had done nothing really suspicious before. Like one of our bureaucrats said: "If we knew enough to suspect Breivik, immagine what we'd know about all of you". That said, if the perpetrator had been a moslem imigrant I doubt the politicians would be unified in this belief.
Checking out seems not to do much.