New Jersey Statutes Title 19. Elections 19 § 15-19

If a person be challenged as convicted of a crime which bars him from exercising the right to vote, he shall be required to answer in relation to such alleged conviction, and if he shall admit that he has been so convicted, he shall not be permitted to vote unless he shall make oath that he has been pardoned or restored by law to the right of suffrage; but if he shall deny that he has been so convicted, no proof of such conviction shall be received, other than the duly authenticated record thereof, except such proof as may be necessary to establish his identity with the person named in such record, or may be adduced by him to rebut the evidence of identity produced on behalf of the challenge.