N.J. Stat. § 18A:16-1.1d: Limit of time for substitute teacher holding standard instructional certificate.

3. A vacant teaching position shall not be filled in any school year by one or more individuals employed as substitute teachers and holding a standard instructional certificate issued by the State Board of Examiners and working in an area not authorized by their credentials for a total amount of time exceeding 40 school days.

L.2010, c.100, s.3.