Yes. Chicago DUI charges are dismissed regularly when the defense identifies a fatal flaw in the state's case. The most common dismissal grounds involve lack of reasonable suspicion for the traffic stop, lack of probable cause for arrest, and improperly administered field sobriety tests that fail NHTSA standards. Breath test dismissals turn on machine calibration records, the 20-minute observation period, and officer certification under Illinois Administrative Code 20 IL Admin Code 1286. A Chicago DUI lawyer files motions to suppress and motions to quash arrest before trial. If the judge grants suppression of the key evidence, the state often cannot proceed and dismisses. Not every case has a dismissal path, but Cook County dismissal rates are meaningful when the facts support the motion.
