N.J. Stat. § 33:1-81.1a
A parent, guardian or other person having legal custody of a person under 18 years of age found in violation of R.S. 33:1-81 or section 1 of P.L. 1979, c.264 (C.2C:33-15) with respect to purchasing, possessing, or consuming any alcoholic beverage or cannabis item available for lawful consumption pursuant to the "New Jersey Cannabis Regulatory, Enforcement Assistance, and Marketplace Modernization Act," P.L. 2021, c. 16(C.24:6I-31 et al.) shall be notified of the violation in writing. The parent, guardian or other person having legal custody of a person under 18 years of age shall be subject to a fine in the amount of $500.00 upon any subsequent violation of R.S. 33:1-81 or section 1 of P.L. 1979, c.264 (C.2C:33-15) on the part of such person if it is shown that the parent, guardian or other person having legal custody failed or neglected to exercise reasonable supervision or control over the conduct of the person under 18 years of age.
N.J.S. § 33:1-81.1a