Illinois roadside cannabis detection combines subjective and chemical layers. Officers first document driving cues, then apply standardized field sobriety tests plus Advanced Roadside Impaired Driving Enforcement observations focused on eyelid tremors, pulse rate, and pupil size. A Drug Recognition Expert may be called in. Chemical confirmation happens through blood or oral fluid testing under 625 ILCS 5/11-501.2. The chicagoduilawyer.net defense playbook targets the DRE protocol heavily: the twelve-step evaluation has been criticized for false positives, and any deviation from the protocol becomes leverage at the motion in limine stage in Cook County courtrooms.
