N.J. Stat. § 30:6C-5
A person over the age of 21 years believing himself or herself to be a person with a substance use disorder involving drugs may be admitted to any State or county institution, hospital, or facility certified by the commissioner as having special facilities for the care and treatment of persons with substance use disorders involving drugs and may receive treatment therein. An application for voluntary admission may be made on behalf of a person who believes himself or herself to be a person with a substance use disorder involving drugs, if the person is under the age of 21 years and unmarried, by a parent, guardian, next of kin, person standing in loco parentis, or by any person having care, custody, and control of such individual. If the superintendent or physician in charge of such hospital or facility certifies that it is in the best interest of the person with a substance use disorder involving drugs, the person may be retained therein for a period not exceeding 30 days for the purpose of care and treatment and thereafter until 15 days after receipt of notice in writing from such person, if the person is over the age of 21 years, or if the person is under such age, from the individual who applied on the person's behalf for admission, of intention to leave such hospital or facility. At any time prior thereto the superintendent or physician in charge upon filing a written certificate with the commissioner, may discharge the person with a substance use disorder involving drugs who is recovered, or for whom treatment in such facility or hospital is no longer suitable.
N.J.S. § 30:6C-5