N.J. Stat. § 43:15A-132
In the case of those persons who elect to continue as members of the State retirement system and thereby waive their rights for participation in the Federal Civil Service Retirement System, they shall continue to be covered under Social Security pursuant to the State's agreement with the Federal Government, but they shall continue to be ineligible for participation in the Public and School Employees Health Benefits program. Since membership in the Public Employees' Retirement System of New Jersey permits eligibility of all members for noncontributory and/or contributory death benefits, such persons who elect to remain as members of the State retirement system shall be barred from participating in any comparable program provided by the Federal Government.
N.J.S. § 43:15A-132