The New Jersey Constitution of 1947 (Annotated) Art. IV, § IV, ¶ 9

9. Members of the Senate and General Assembly shall, in all cases except treason and high misdemeanor, be privileged from arrest during their attendance at the sitting of their respective houses, and in going to and returning from the same; and for any statement, speech or debate in either house or at any meeting of a legislative committee, they shall not be questioned in any other place.