The Illinois DUI Laws Chicago Drivers Need to Know

DWI/DUI

April 10, 2026

The Illinois DUI Laws Chicago Drivers Need to Know

As a Chicago driver it is important to be well-versed in Illinois DUI laws, as these are your protections if you are ever pulled over. If your DUI charges involve any violation of Illinois law, we are prepared to file motions to suppress evidence and to fight for a case dismissal on your behalf.

When you’re facing DUI charges in Chicago, it is imperative that you contact Combs Waterkotte as soon as possible at (314) 900-HELP or reach out online to schedule a free, confidential consultation with one of our proven, Chicago DUI defense attorneys.

What This Guide Covers

  • Illinois’ DUI laws
  • How understanding the law can protect you
  • Why you can trust Combs Waterkotte

Illinois’ DUI Laws

The basic Illinois DUI laws you should be aware of include:

  • Legal Limit Law (625 ILCS 5/11-501): In Illinois, it is illegal to drive with a blood alcohol content (BAC) level of 0.08% or higher, if you are 21 or older.
  • Zero Tolerance Law (625 ILCS 5/11-501.8): If you are under 21, Illinois has a “Zero Tolerance Policy” and any trace of alcohol in your system, while driving, can result in DUI charges being filed against you.
  • Drug DUI Law (625 ILCS 5/11-501): If you weren’t driving drunk, but you were allegedly driving while impaired by drugs, you can still be charged with a DUI in Illinois. The state sets the limit for the THC in cannabis, for example, and even if you are below this limit you can still be arrested if the officer believed you to be impaired.
  • Commercial Drivers Law (625 ILCS 5/11-501): The legal limit for a commercial drivers license (CDL) holder is 0.04%, whether you are driving your commercial or personal vehicle. If you are convicted of a first-time DUI as a CDL driver, you can face a one year CDL disqualification or a three year disqualification if you were transporting hazardous materials. A second offense will result in a lifetime revocation of your CDL.
  • Implied Consent (625 ILCS 5/11-501.1): If you drive in Illinois, then you automatically consent to chemical tests (breath or blood) being taken if you are arrested for DUI. If you refuse or fail these tests, then you will face a Statutory Summary Suspension of your driving privileges.
  • Statutory Summary Suspension (625 ILCS 5/11-501.1): For a first time refusal to take a chemical test, you will be facing a 12 month license suspension. For any subsequent refusals, you will be facing a 3-year license suspension.
  • Aggravated DUI (625 ILCS 5/11-501(d): A felony offense, ranging from a Class 4 felony to a Class X felony, an aggravated offense in Illinois involves three or more DUI offenses, causing great bodily harm or transporting a child under 16.

Why Understanding IL Law Matters in Your Chicago DUI Case

What you do and what you say after being stopped on suspicion of driving under the influence in Chicago can greatly affect your case. Understanding Illinois DUI laws will ensure you make informed decisions in high pressure situations.

Here are examples of how understanding Illinois’ laws can benefit your case:

  • Probable Cause: To be pulled over for a DUI in Illinois, an officer must probable cause to stop your vehicle and place you under arrest.
  • Implied Consent: Not understanding Illinois’ strict laws on implied consent, could result in you losing your driving privileges before criminal charges are even filed.
  • Field Sobriety Testing: If you submit to field sobriety tests, which you are not legally required to submit to, you will potentially give the prosecution additional evidence to use against you.

While having a general understanding of DUI laws is indeed helpful, the best way to have a complete and accurate understanding of your rights and legal options in a DUI case is to consult with a Chicago criminal defense lawyer.

Contact Combs Waterkotte: We’re the Experienced Chicago DUI Lawyers You Want Behind You

At Combs Waterkotte, we know Illinois DUI laws inside and out and we are familiar with local court procedures and enforcement trends in Chicago. We will apply our knowledge directly to the specifics surrounding your case and make sure your rights weren’t violated during your stop or arrest.

In your hour of need, you can confidently turn to us because:

  • We are a legal team that includes former prosecutors and a former cop
  • We have successfully handled 10,000+ cases
  • We have more than 80 years of combined legal experience
  • We take a trial-ready approach, to ensure your case is as strong as possible

For the best defense strategy, tailored to your case and upon the latest legal standards and Illinois case law, call Combs Waterkotte at (314) 900-HELP or contact us online today. We’ll help you make informed decisions, avoid costly mistakes and put yourself in the strongest possible position moving forward.