(5 ILCS 100/5-20) (from Ch. 127, par. 1005-20)
    Sec. 5-20. Implementing discretionary powers. Each rule that implements a discretionary power to be exercised by an agency shall include the standards by which the agency shall exercise the power. The standards shall be stated as precisely and clearly as practicable under the conditions to inform fully those persons affected.
(Source: P.A. 87-823.)