We have the same problem here in Iowa.
Out of our four seasons there is always some type of critter to hunt. Weapons to be used for such activities are shot gun, muzzler loader, Bow, if you fish you typically carry a cleaning knife. If you trap you carry a sidearm.
All these things can be found in almost any youth sportsman's car sitting in the
High School parking lot.
Such things need to be dealt with by the school administration with logic and common sense.
For cry'n out loud the 4x4's have gun racks in the back window.