I've heard reports that they are bringing charges against the guy from Rolla who made the online threats the other night. I don't see what they can really do to him.
He was 93 miles away from MU and had no guns or anything. His was a completely non-credible troll threat. And the threats were made on Yik Yak, which is basically troll center: people say anything and everything there. It is an unrestricted online free-speech zone. Unfortunately in America right now free speech = hate speech. Of course they were right to arrest him and hold and question him. They had too. But as far as actual charges? Not so much.
BUT..... as a student in the UM system making threats to other UM students I'm sure he has ran afoul of the rules of student conduct. I'm guessing he could probably be expelled and barred from future enrollment. For a kid in his position, that punishment could very well ruin his future, and so is more than enough.