(a)(1) For crimes committed on or after May 6, 2002, the verdict of the jury shall be either "guilty" or "not guilty," "not guilty by reason of insanity," "guilty and mentally ill at the time of the offense," or "not guilty of the crime charged but guilty of a lesser included offense," or "not guilty of the crime charged but guilty of a lesser included offense and mentally ill at the time of the offense," provided that when the defense of mental illness has been asserted and the defendant is acquitted on the ground that he was insane at the time of the commission of the offense charged, the verdict shall be "not guilty by reason of insanity."(a)(2) For crimes committed before May 6, 2002, the defendant may elect to proceed under subsection (a)(1) or under (a)(3).(a)(3) For crimes committed before May 6, 2002, unless the defendant elects to proceed under subsection (a)(1), the verdict of the jury shall be either "guilty," "not guilty," "not guilty by reason of insanity," "guilty and mentally ill," "not guilty of the crime charged but guilty of a lesser included offense," or "not guilty of the crime charged but guilty of a lesser included offense and mentally ill" provided that when the defense of mental illness has been asserted and the defendant is acquitted on the ground that he was insane at the time of the commission of the offense charged, the verdict shall be "not guilty by reason of insanity." (b) The verdict shall be unanimous. It shall be returned by the jury to the judge in open court and in the presence of the defendant and counsel. If the defendant voluntarily absents himself, the verdict may be received in his absence.(c) If there are two or more defendants, the jury at any time during its deliberations may return a verdict or verdicts with respect to any defendant as to whom it has agreed. If the jury cannot agree with respect to all, the defendant or defendants as to whom it does not agree may be tried again.(d) When the defendant may be convicted of more than one offense charged, each offense of which the defendant is convicted shall be stated separately in the verdict.(e) The jury may return a verdict of guilty to the offense charged or to any offense necessarily included in the offense charged or an attempt to commit either the offense charged or an offense necessarily included therein.(f) When a verdict is returned and before it is recorded, the jury shall be polled at the request of any party or may be polled at the court's own instance. If, upon the poll, there is no unanimous concurrence, the jury may be directed to retire for further deliberations or may be discharged. If the verdict is unanimous, it shall be recorded.(g) If judgment of acquittal is given on a verdict or the case is dismissed and the defendant is not detained for any other legal cause, he shall be discharged as soon as the judgment is given. If a verdict of guilty is returned, the court may order the defendant to be taken into custody to await judgment on the verdict or may permit the defendant to remain on bail.