405 ILCS 5/3-803

The court may appoint one or more physicians, qualified examiners, clinical psychologists or other experts to examine the respondent and make a detailed written report of his findings regarding the respondent's condition. Any such physician or other examiner so appointed may interview by telephone or in person any witnesses or other persons listed in the petition for involuntary admission. The report shall be filed with the court and copies shall be made available to the attorneys for the parties.