(720 ILCS 5/31-8) (from Ch. 38, par. 31-8)
    Sec. 31-8. Refusing to aid an officer.
    Whoever upon command refuses or knowingly fails reasonably to aid a person known by him to be a peace officer in:
    (a) Apprehending a person whom the officer is authorized to apprehend; or
    (b) Preventing the commission by another of any offense, commits a petty offense.
(Source: P.A. 77-2638.)