The Supreme Court of New Jersey is the highest court in the U.S. state of New Jersey. In its current form, the Supreme Court of New Jersey is the final judicial authority on all cases in the state court system, including cases challenging the validity of state laws under the state constitution. It has the sole authority to prescribe and amend court rules and regulate the practice of law, and it is the arbiter and overseer of the decennial legislative redistricting. One of its former members, William J. Brennan Jr., became an Associate Justice of the Supreme Court of the United States.