New York Consolidated Laws, Retirement and Social Security Law - RSS § 213. Membership in retirement system or service credit not allowed for employment under this article

a. The provisions of any local law or charter notwithstanding, no retired person employed in public service pursuant to the provisions of this article shall be required or permitted to become a member of any retirement system or pension plan administered by the state or any of its political subdivisions.

b. Member service credit may not be purchased or granted in any retirement system or pension plan administered by the state or any of its political subdivisions for any period of employment in public service authorized under the provisions of this article.