The initial reports said he was unarmed. When I heard about the weapons charge my first thought was they just wanted to tack on something so it wouldn't only be a trespass violation. The folding aspect of the knife, no doubt, makes it more deadly in the same way that a handgun is more deadly than a long gun. (Assault weapons, short and long, are in another category, because like this evil knife, they are black and scary looking [sorry for that racist comment])