New York Consolidated Laws, Criminal Procedure Law - CPL § 620.70 Material witness order;  compelling attendance of witness who fails to appear

If a witness at liberty on bail pursuant to a material witness order cannot be found or notified at the time his appearance as a witness is required, or if after notification he fails to appear in such action or proceeding as required, the court may issue a warrant, addressed to a police officer, directing such officer to take such witness into custody anywhere within the state and to bring him to the court forthwith.