A. If any person possesses any (i) stun weapon as defined in this section; (ii) knife, except a pocket knife having a folding metal blade of less than three inches; or (iii) weapon, including a weapon of like kind, designated in subsection A of §
18.2-308, other than a firearm; upon (a) the property of any public, private or religious elementary, middle or high school, including buildings and grounds; (b)
that portion of any property open to the public and then exclusively used for school-sponsored functions or extracurricular activities while such functions or activities are taking place; or (c) any school bus owned or operated by any such school, he shall be guilty of a Class 1 misdemeanor.