DUI FAQs

Frequently Asked Questions About DUI in Illinois

What is the legal blood alcohol concentration (BAC) limit in Illinois?

In Illinois under 625 ILCS 5/11-501, the legal BAC limit is 0.08% for drivers aged 21 and older. Commercial drivers face a stricter 0.04% limit. Drivers under 21 are bound by zero-tolerance laws under 625 ILCS 5/11-501.8, making any detectable alcohol level above 0.00% grounds for immediate driver’s license suspension.

Can I be charged with a DUI if my BAC is under 0.08%?

Yes, under 625 ILCS 5/11-501(a)(2), you can face DUI charges even with a lower BAC. Illinois law penalizes driving while impaired by alcohol, cannabis, controlled substances, or prescription drugs. Demonstrable driver impairment on public roadways remains the primary standard for law enforcement officers during a traffic stop. 

What is a Statutory Summary Suspension in Illinois?

A Statutory Summary Suspension under 625 ILCS 5/11-501.1 is an administrative procedure managed by the Illinois Secretary of State. It automatically suspends driving privileges on the 46th day following arrest if chemical tests are failed or refused. This administrative process remains completely independent from criminal court proceedings. 

What happens if I refuse a chemical test during a DUI stop?

Refusing testing triggers an automatic license suspension under 625 ILCS 5/6-208.1 implied consent guidelines. A first-time refusal results in a 12-month suspension compared to six months for test failure. A second refusal within five years increases the statutory summary suspension period to three full years. 

What are the criminal penalties for a first-time DUI conviction?

Under 625 ILCS 5/11-501(c)(1), a first DUI conviction is typically classified as a Class A misdemeanor. Penalties include up to 364 days in jail, court fines reaching $2,500, and a minimum one-year driver’s license revocation under 625 ILCS 5/6-205. Mandatory community service, treatment programs, and court assessments also apply. 

What is a Monitoring Device Driving Permit (MDDP)?

Governed by 625 ILCS 5/6-206.1, an MDDP enables eligible first-time offenders to drive legally during a statutory summary suspension. To qualify, you must install a Breath Alcohol Ignition Interlock Device (BAIID). The permit allows unrestricted driving during the suspension term, provided the device is properly maintained. 

How does a second DUI offense differ from a first offense?

Under 625 ILCS 5/11-501(c)(2), a second DUI conviction carries mandatory minimum penalties. Offenders face either 5 days of jail or 240 hours of community service. Pursuant to 625 ILCS 5/6-208, driver’s license revocation increases to a minimum five-year period before reinstatement eligibility.

Is a DUI considered a felony in Illinois?

First and second DUIs are generally Class A misdemeanors, but a third offense escalates to a Class 2 felony under 625 ILCS 5/11-501(d)(2)(B). DUIs become Aggravated DUIs (felonies) if committed without insurance, without a valid license, or if the incident causes severe personal injury or death. 

Can a DUI conviction be expunged or sealed in Illinois?

No, DUI convictions cannot be expunged or sealed under 20 ILCS 2630/5.2. Once a formal court conviction is entered for driving under the influence, it permanently remains on public criminal and driving records. Receiving court supervision is the primary way to avoid a permanent criminal conviction entry.

What is court supervision for a DUI charge?

Authorized under 730 ILCS 5/5-6-1(c), court supervision is a disposition available to eligible first-time offenders. The court defers entering a judgment of guilt while monitoring compliance. Successful completion prevents a formal conviction on your public record, though underlying arrest and summary suspension entries remain recorded. 

What extra penalties apply if my BAC was 0.16% or higher?

Under 625 ILCS 5/11-501(c)(4), a BAC of 0.16% or higher mandates enhanced penalties. First-time offenders face a minimum $500 fine and 100 hours of community service. A second offense with a 0.16% BAC requires a mandatory 2 days in jail and $1,250 fine under 625 ILCS 5/11-501(c)(5). 

What penalties occur if a child is in the car during a DUI?

Transporting a minor under age 16 during a DUI triggers mandatory penalty enhancements under 625 ILCS 5/11-501(c)(3). First-time offenders face a mandatory $1,000 fine and 25 days of community service benefiting children. A second offense while transporting a minor escalates to a Class 2 felony under 625 ILCS 5/11-501(d)(1)(K).

What is a Breath Alcohol Ignition Interlock Device (BAIID)?

Regulated by 625 ILCS 5/1-105.2, a BAIID connects directly to a vehicle’s ignition system. It prevents engine startup if alcohol is detected on the driver’s breath. Illinois law requires BAIID installation for motorists driving under a Monitored Device Driving Permit or Restricted Driving Permit. 

Can I legally drive out of state if my Illinois license is suspended?

No, driving in other states while suspended in Illinois is illegal under national interstate Compact agreements. Illinois actions are shared via the National Driver Register pursuant to 625 ILCS 5/6-702. Operating a vehicle elsewhere during an active suspension risks additional criminal charges, extended revocation periods, and vehicle impoundment.

How does cannabis legalization affect DUI laws in Illinois?

Pursuant to 625 ILCS 5/11-501.2(a), legal cannabis use does not authorize driving impaired. A concentration of 5 nanograms or more of delta-9-THC per milliliter of blood constitutes statutory impairment. Furthermore, law enforcement officers can prove impairment through field observations regardless of exact chemical laboratory levels. 

What happens during an Illinois field sobriety test?

Field sobriety assessments are standardized tools used by law enforcement to evaluate driver impairment under 625 ILCS 5/11-501.2. Standard tests include Horizontal Gaze Nystagmus, Walk-and-Turn, and One-Leg Stand. Officers use performance observations on these voluntary roadside tests to establish reasonable physical grounds and probable cause for arrest.

How do I challenge a Statutory Summary Suspension in court?

Under 625 ILCS 5/2-118.1, you must file a Petition to Rescind the Statutory Summary Suspension. Challenges are limited to specific statutory grounds, such as whether the officer had probable cause, issued proper warnings, or whether chemical tests were properly administered and recorded. 

What are the financial costs associated with an Illinois DUI?

Beyond court fines reaching $2,500 under 625 ILCS 5/11-501, total expenses accrue quickly. Drivers face a $500 Secretary of State reinstatement fee under 625 ILCS 5/6-118, mandatory BAIID administration fees, evaluation costs, increased insurance premiums, and court fees, often totaling several thousand dollars.

Do I need to undergo an alcohol evaluation after a DUI arrest?

Yes, under 625 ILCS 5/11-501.01, Illinois mandates a professional alcohol and drug evaluation before sentencing or permit issuance. The assessment determines a specific risk classification level. This rating dictates the mandatory minimum hours of remedial driver education or clinical treatment required for court compliance.

Why should I hire an experienced DUI defense attorney?

Navigating complex Illinois vehicle codes and court rules requires dedicated legal analysis. Defense counsel evaluates officer stop procedures, reviews chemical testing validity, and files petitions under 625 ILCS 5/2-118.1. Legal representation helps protect driver privileges, manage statutory deadlines, and pursue charge reductions or case dismissals.

These are just a few of the most common DUI FAQs we get from clients. If you have other questions, we are happy to help.

Speak with an Experienced Orland Park DUI Defense Attorney Today

If you’ve been arrested for a DUI, you probably have a lot of questions, some of which may not be covered by these DUI FAQs. At the Fotopoulos Law Office, we have more than two decades of experience helping drivers get back on the road after a DUI conviction. And, as a former Cook County Circuit Judge, Attorney Fotopoulos commands an unrivaled understanding of the law and what it takes to obtain the best possible results for his clients. To learn more, and to schedule a free consultation with a dedicated criminal defense attorney to discuss your case, call the Fotopoulos Law Office at 708-942-8400. You can also connect with us through our online contact form. We proudly represent clients in Cook, Will, DuPage, Champaign and Kankakee counties.

Last Updated: September 2026