405 ILCS 5/5-101
If any recipient of services leaves a facility without being duly discharged or being free to do so, as provided in this Act, or if any resident is placed on conditional discharge or temporarily released from the facility and if such recipient is considered by the facility director to be in such condition as to require immediate detention for the protection of such recipient or other persons, then upon the request of the facility director of the facility, any peace officer shall apprehend such recipient and return him to the nearest Department facility which provides residential services. The Department shall then arrange for the return of the recipient to the appropriate facility. The cost of returning a recipient whose absence from a private facility or a Veterans Administration facility is unauthorized shall be paid by such facility. If the unauthorized absence is from a facility of the Department, such cost shall be paid by the Department in accordance with the fee schedule set forth in Section 19 of "An Act concerning fees and salaries, and to classify the several counties of the state with reference thereto", approved March 29, 1872, as now or hereafter amended.
405 ILCS 5/5-101