725 ILCS 5/111-6

Bill of particulars.

When an indictment, information or complaint charges an offense in accordance with the provisions of Section 111-3 of this Code but fails to specify the particulars of the offense sufficiently to enable the defendant to prepare his defense the court may, on written motion of the defendant, require the State's Attorney to furnish the defendant with a Bill of Particulars containing such particulars as may be necessary for the preparation of the defense. At the trial of the cause the State's evidence shall be confined to the particulars of the bill.