N.Y. Second Class Cities Law § 243: Witnesses not to be excused from testifying

§ 243. Witnesses not to be excused from testifying. In any criminal

proceeding before a court or grand jury or in any investigation or

inquiry before the common council, or any committee thereof, or before

any officer conducting an investigation, touching the knowledge of such

witness as to any offense committed in violation of the provisions of

this chapter or ordinance of the city; the court or grand jury, or the

common council, committee or officer, may confer immunity in accordance

with the provisions of section 50.20 or 190.40 of the criminal procedure

law; provided, however, that no immunity shall be conferred except upon

twenty-four hours prior written notice to the appropriate district

attorney having an official interest therein.