This says they failed to even investigate. They could have talked to him. If he was clearly a threat, even if they had no legal avenues to retain him, they coul

This says they failed to even investigate. They could have talked to him. If he was clearly a threat, even if they had no legal avenues to retain him, they could have notified the school, local police, etc., which perhaps could have done something. For example, the school could have increased security.