Section 720 ILCS 5/3-3 - Multiple prosecutions for same act(a) When the same conduct of a defendant may establish the commission of more than one offense, the defendant may be prosecuted for each such offense.(b) If the several offenses are known to the proper prosecuting officer at the time of commencing the prosecution and are within the jurisdiction of a single court, they must be prosecuted in a single prosecution, except as provided in Subsection (c), if they are based on the same act.(c) When 2 or more offenses are charged as required by Subsection (b), the court in the interest of justice may order that one or more of such charges shall be tried separately.