Commencing September 1, 2002, no person shall be employed by a board of education of a school district as a buildings and grounds supervisor unless he is a certified educational facilities manager; except that when a vacancy occurs in a position in which the duties of a buildings and grounds supervisor are performed, a board may select, for a period not to exceed two years and commencing on the date of the vacancy, a person who is not a certified educational facilities manager to perform on an interim basis, the duties of a buildings and grounds supervisor.
N.J.S. § 18A:17-50