New Jersey Statutes Title 59. Claims Against Public Entities 59 § 6-5

a. Neither a public entity nor a public employee is liable for injury resulting from diagnosing or failing to diagnose that a person has a mental illness or is a person with a substance use disorder involving drugs or from failing to prescribe for mental illness or a substance use disorder involving drugs;  provided, however, that nothing in this subsection exonerates a public entity or a public employee who has undertaken to prescribe for a mental illness or a substance use disorder involving drugs from liability for injury proximately caused by negligence or by a wrongful act in so prescribing.

b. Nothing in subsection a. exonerates a public entity or a public employee from liability for injury proximately caused by a negligent or wrongful act or omission in administering any treatment prescribed for a mental illness or a substance use disorder involving drugs.