---
title: "When do Chicago DUI charges actually get dismissed?"
description: "Chicago DUI charges get dismissed most often when pretrial motion practice knocks out the state's key evidence. The frequent dismissal triggers are: the traffic stop was unlawful (no reasonable..."
url: https://chicagoduilawyer.net/faq-items/when-do-chicago-dui-charges-actually-get-dismissed/
date: 2026-07-08
modified: 2026-07-08
author: "Chicago DUI Lawyer"
type: faq
lang: en
---

# When do Chicago DUI charges actually get dismissed?

Chicago DUI charges get dismissed most often when pretrial motion practice knocks out the state's key evidence. The frequent dismissal triggers are: **the traffic stop was unlawful** (no reasonable articulable suspicion), **the arrest lacked probable cause**, **the breathalyzer was not properly calibrated or the officer was not certified** under 20 IL Admin Code 1286, **the 20-minute observation period was violated**, **the field sobriety tests were administered outside NHTSA standards**, or **discovery violations** where the state cannot produce required evidence like squad video within statutory windows. Non-motion dismissals happen when a critical civilian witness will not appear, when the officer fails to appear at trial, or when a lab technician cannot testify to breath test foundation. Not every case has a dismissal path.