N.Y. Crim. Proc. Law § 620.70

§ 620.70 Material witness order; compelling attendance of witness who\n fails to appear.\n If a witness at liberty on bail pursuant to a material witness order\ncannot be found or notified at the time his appearance as a witness is\nrequired, or if after notification he fails to appear in such action or\nproceeding as required, the court may issue a warrant, addressed to a\npolice officer, directing such officer to take such witness into custody\nanywhere within the state and to bring him to the court forthwith.\n