N.J. Ct. R. 3:15-3

(a) Joinder of Criminal Offense and Lesser Related Infraction.

(1) Except as provided in paragraph (b), the court shall join any pending non-indictable complaint for trial with a criminal offense based on the same conduct or arising from the same episode.

(2) Regardless of whether a jury sits as the finder of facts with respect to the criminal offense, and unless the complaint charges a disorderly persons offense or a petty disorderly persons offense that must be submitted to the jury in accordance with the provisions of N.J.S.A.2C:1-8(e), the Superior Court judge shall sit as a municipal court judge on the complaint and shall render the verdict with respect to the complaint on the proofs adduced in the course of trial.

(3) If evidence is held to be admissible with respect to the trial of the complaint but inadmissible with respect to the trial of the criminal offense, the court shall hear that evidence outside of the jury's presence and may, in its discretion, postpone such hearing until the jury has retired to deliberate. The court shall not render its verdict on the complaint until the jury has rendered its verdict or until the jury has been dismissed.

(b) Relief From Joinder. If for any reason it appears that a defendant or the State is prejudiced by the joinder required by paragraph (a), the court may decline to join or may grant other appropriate relief. A defendant's request to avoid joinder shall constitute a waiver of any claim against twice being placed in jeopardy that would not have arisen had the defendant's request been denied.

(c) Consequence of Failure to Join. In no event shall failure to join as required in paragraph (a) be deemed to constitute grounds for barring a subsequent prosecution of the complaint except as required by statute or by the Federal or State Constitutions.