§ 265.06 Unlawful possession of a weapon upon school grounds. It  shall be unlawful for any person age sixteen or older to knowingly  possess any air-gun, spring-gun or other instrument or weapon  in  which  the  propelling  force  is  a spring, air, piston or CO2 cartridge in or  upon a building or  grounds,  used  for  educational  purposes,  of  any  school, college or university, without the written authorization of such  educational institution. Unlawful possession of a weapon upon school grounds is a violation.