Carry laws in the US vary by state. In CO I believe it is legal. There have been questions on city ordinences in variation with state laws, but again this varies by state.
My reaction is gun laws don't work as Canada is proving, once again.
Each state has different rules about CCW on campus....most would require you to register with University police also
Just heard that one of the gunman shot people in front of two officers. Obviosuly the school police don't cary guns.
But you do realize that if a long-gun is involved, then Canada's gun laws have no bearing on this event whatsoever?