N.J. Stat. Ann. § 18A:36-29

The sheriff of each county shall work in conjunction with local law enforcement officials and local boards of education to provide a fingerprint program for the protection of its students. The sheriff shall visit each public school and shall, at the request of a parent or guardian or temporary caretaker, provide each student in any grades from kindergarten through nine with the opportunity to have the student's fingerprints taken as provided in this act.