N.Y. Comp. Codes R. & Regs. tit. 14, § 540.11
(a) In the event a patient leaves the grounds of the facility without prior authorization, the clinical director, the unit chief, the patient's physician, the patient's treatment team leader or any other member of the clinical staff shall immediately notify:
(10) the Mental Hygiene Legal Service.
Each notice shall be given by telephone or by any other means reasonably calculated to give prompt actual notice. The police having jurisdiction over the area in which a person who might be harmed resides shall be notified if that person is not contacted by telephone. The facility shall keep a record of all notices given pursuant to this section.