§ 133.02 REFUSING TO AID AN OFFICER.
   Whoever upon command refuses or knowingly fails reasonably to aid a person known by him or her 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.
(720 ILCS 5/31-8) Penalty, see § 133.99