N.J. Stat. § 40:23-6.30
The board of chosen freeholders of any county of the first class having a population in excess of 800,000 may establish and maintain a program for the rehabilitation of youthful offenders by the operation or the support of centers which provide treatment for persons under 18 years of age adjudged delinquents or convicted of crime, whether public or operated privately by a nonprofit organization, and which provide work projects, training, therapy or other rehabilitation treatment for youthful offenders. Such program may be carried on by the establishment and operation of separate facilities, by conducting the same as a separate program in connection with an existing county or municipal facility or institution or by contract with such a nonprofit organization.
N.J.S. § 40:23-6.30