(g) Weapons possession. Possession of one or more weapons as defined by subparagraph (v) of this paragraph, except possession in a classroom or laboratory as part of an instructional program or in a school-related activity under the supervision of a teacher or other school personnel as authorized by school officials which are discovered either through: (1) routine security checks; or (2) weapons possessed at a school function or on school property which are not discovered through a routine security check, including but not limited to, weapons found in the possession of a student or within a locker.

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.

2. The board of education or the trustees, as defined in section two of this chapter, of every school district within the state, however created, and every board of cooperative educational services and county vocational extension board, shall adopt and amend, as appropriate, a code of conduct for the maintenance of order on school property, including a school function, which shall govern the conduct of students, teachers and other school personnel as well as visitors and shall provide for the enforcement thereof. Such policy may be adopted by the school board or trustees only after at least one public hearing that provides for the participation of school personnel, parents, students and any other interested parties. Such code of conduct shall include, at a minimum: d. disciplinary measures to be taken in incidents involving the possession or use of illegal substances or weapons, the use of physical force, vandalism, violation of another student’s civil rights and threats of violence

d.  [Eff until June 30, 2018] (1) Consistent with the federal gun-free schools act, any public school pupil who is determined under this subdivision to have brought a firearm to or possessed a firearm at a public school shall be suspended for a period of not less than one calendar year and any nonpublic school pupil participating in a program operated by a public school district using funds from the elementary and secondary education act of nineteen hundred sixty-five who is determined under this subdivision to have brought a firearm to or possessed a firearm at a public school or other premises used by the school district to provide such programs shall be suspended for a period of not less than one calendar year from participation in such program. The procedures of this subdivision shall apply to such a suspension of a nonpublic school pupil. A superintendent of schools, district superintendent of schools or community superintendent shall have the authority to modify this suspension requirement for each student on a case-by-case basis. The determination of a superintendent shall be subject to review by the board of education pursuant to paragraph c of this subdivision and the commissioner pursuant to section three hundred ten of this chapter. Nothing in this subdivision shall be deemed to authorize the suspension of a student with a disability in violation of the individuals with disabilities education act or article eighty-nine of this chapter. A superintendent shall refer the pupil under the age of sixteen who has been determined to have brought a weapon or firearm to school in violation of this subdivision to a presentment agency for a juvenile delinquency proceeding consistent with article three of the family court act except a student fourteen or fifteen years of age who qualifies for juvenile offender status under subdivision forty-two of section 1.20 of the criminal procedure law. A superintendent shall refer any pupil sixteen years of age or older or a student fourteen or fifteen years of age who qualifies for juvenile offender status under subdivision forty-two of section 1.20 of the criminal procedure law, who has been determined to have brought a weapon or firearm to school in violation of this subdivision to the appropriate law enforcement officials.

(2)  Nothing in this paragraph shall be deemed to mandate such action by a school district pursuant to subdivision one of this section where such weapon or firearm is possessed or brought to school with the written authorization of such educational institution in a manner authorized by article two hundred sixty-five of the penal law for activities approved and authorized by the trustees or board of education or other governing body of the public school and such governing body adopts appropriate safeguards to ensure student safety.

(3)  As used in this paragraph:

• (i)  “firearm” shall mean a firearm as defined in subsection a of section nine hundred twenty-one of title eighteen of the United States Code;