2022 New York Laws
PEN - Penal
Part 3 - Specific Offenses
Title P - Offenses Against Public Safety
Article 265 - Firearms and Other Dangerous Weapons
265.01-A - Criminal Possession of a Weapon on School Grounds.

§ 265.01-a Criminal possession of a weapon on school grounds.
A  person  is  guilty  of  criminal  possession  of a weapon on school
  grounds when he or she knowingly has in his or her possession  a  rifle,
  shotgun,  or  firearm  in  or  upon  a  building  or  grounds,  used for
  educational purposes, of any school, college, or university, except  the
  forestry lands, wherever located, owned, maintained or held in trust for
  the  benefit  of  the  New  York  State  College of Forestry at Syracuse
  University, now known as the State University of  New  York  college  of
  environmental  science  and forestry, or upon a school bus as defined in
  section one hundred forty-two of the vehicle and  traffic  law,  without
  the  written  authorization  of  such educational institution; provided,
  however no school, as defined  in  subdivision  ten  of  section  eleven
  hundred  twenty-five  of  the  education  law,  shall issue such written
  authorization to any teacher,  school  administrator,  or  other  person
  employed  at  the  school  who  is  not  primarily  employed as a school
  resource officer, police officer, peace officer, or security  guard  who
  has  been  issued  a special armed guard registration card as defined in
  section eighty-nine-f of the general business law, regardless of whether
  the person is employed directly by such school or by a third party.
Criminal possession of a weapon on school grounds is a class E felony.