Rule 6.8. Indictment — Amendment

(a) Matters of Form, Time, Place, Names. At any time before or during trial, the court may, upon application of the people and with notice to the defendant and opportunity for the defendant to be heard, order the amendment of an indictment with respect to defects, errors, or variances from the proof relating to matters of form, time, place, and names of persons when such amendment does not change the substance of the charge, and does not prejudice the defendant on the merits. Upon ordering an amendment, the court, for good cause, may grant a continuance to accord the defendant adequate opportunity to prepare his defense.

(b) Prohibition as to Substance. No indictment may be amended as to the substance of the offense charged.