405 ILCS 5/3-804
The respondent is entitled to secure an independent examination by a physician, qualified examiner, clinical psychologist or other expert of his or her choice. If the respondent is unable to obtain an examination in an involuntary admission proceeding, a discharge proceeding under Section 3-901 of this Code, or in a proceeding under Section 2-107.1 of this Code, the respondent may request that the court order an examination to be made by a physician, qualified examiner, clinical psychologist, or other expert. Any such physician or other examiner, whether secured by the respondent or appointed by the court, may interview by telephone or in person any witnesses or other persons listed in the petition for involuntary admission, the petition for discharge under Section 3-901 of this Code, or in the petition for medication or therapy under Section 2-107.1 of this Code.
The physician or other examiner may submit to the court a report in which his or her findings are described in detail. The court must determine the compensation of the examiner or other expert. The compensation must be paid by the respondent's county of residence unless the respondent is not a resident of this State, in which case the fee must be paid by the county in which the proceeding is pending.
405 ILCS 5/3-804