N.J. Stat. § 30:4-107.1
Whenever a minor with a developmental disability or adult with a mental deficiency is receiving functional services without court order, and is resident at a State school, or private residential institution, or a resource family home, or similar accommodation by arrangement of the commissioner, the commissioner shall cause such person to be released to the immediate custody of his parent or guardian of the person, as the case may be, on written application of said parent or guardian. Release shall be effected as promptly as possible, provided, however, that 48 hours' notice may be required. The department shall thereafter continue to provide such functional services as may be appropriate, unless functional services are terminated as hereinafter provided in this act.
N.J.S. § 30:4-107.1