Section 455. Hospitals; special policemen; powers and duties

1. The
  director of each hospital in the department may designate attendants  or
  other employees to act as special policemen whose duty it shall be under
  the  orders  of  the  director  to  protect  the  grounds, buildings and
  patients of the hospital and to eject therefrom disorderly persons. Such
  attendants and employees, acting as special policemen, shall possess all
  the powers of peace officers, as  set  forth  in  section  2.20  of  the
  criminal procedure law, on the grounds and premises.
    2.  The  designation  of  such  attendants  and  employees  as special
  policemen in pursuance hereof, shall not be deemed to supersede, on  the
  grounds  and premises of such hospital, the authority of peace or police
  officers of the jurisdiction within which such hospital is located.