New Jersey Statutes Title 2B. Court Organization and Civil Code 2B § 22-3

a. The Administrative Director of the Courts, upon receipt of an order directing the impaneling of a State grand jury, shall prepare a list of prospective jurors randomly drawn from the current jurors lists of the several counties. The list of prospective State grand jurors prepared by the Administrative Director of the Courts shall contain numbers of prospective jurors from each county in the same relative proportion as the population of each county bears to the total population of the State.

b. The designated judge shall impanel a State grand jury from the prospective jurors on the list. The selection of jurors for service on the State grand jury shall be public and random.