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.
New York Legal Code