No board of education or contractor shall approve or assign an individual, as a driver or substitute driver of a school bus, without first complying with the provisions of this chapter, and any person violating, or failing to comply with such provisions shall be subject to a fine of:
It shall not be a defense to avoid liability under this section that a board of education or contractor unknowingly failed to comply with the provisions of this chapter.
N.J.S. § 18A:39-20