N.J. Stat. Ann. § 40A:9-154.2

2. Every adult school crossing guard shall be trained for the proper performance of his duties and responsibilities. Such training shall consist of a minimum of two hours of classroom instruction which shall include information on methods of traffic control and the duties and responsibilities of adult school crossing guards and a minimum of 20 hours of field training in which the trainee shall be supervised by an experienced adult school crossing guard or a regular police officer. This training requirement may be waived by the chief of police for an adult school crossing guard who is also a police officer.