[jocoscout]

Id say just carry a good folding knife. If you mess up and forget to take a gun out of your truck before going to school it could end up very badly for you. A knife or hatchet would still get you in trouble but it would be a lot less than a firearm, especially the type (short shotgun or pistol) you're talking about. In this environment you wouldn't get much if any benefit of the doubt. Be smart and don't carry a gun in your truck yet, like dusty said you could end up in a world of trouble and its just not worth it.