Illinois DUI FAQ for Lake County Drivers

Reviewed by Alan E. Jones, an Illinois DUI defense attorney and Principal at Alan E. Jones, P.C. Last updated October 27, 2026.

Alan E. Jones has defended DUI charges in the 19th Judicial Circuit since 1989. This Illinois DUI FAQ answers the questions that come up after the arrest and the suspension, which my Lake County DUI defense pages explain. If your question is about your own case, a consultation will answer it better than a page can, because the answer usually depends on your driving record.

Can a DUI in Illinois End With Court Supervision Instead of a Conviction?

A first DUI in Illinois can end with court supervision, which is not a conviction. The judge postpones sentencing and sets conditions. If you complete all of them, the charge is dismissed without a finding of guilt. The rules are in 730 ILCS 5/5-6-1 and 730 ILCS 5/5-6-3.1, and the supervision period cannot run longer than two years.

Supervision is never automatic, and for DUI it is available once. The statute rules it out if you have ever been convicted of DUI, ever received supervision for DUI, or ever pleaded guilty to reckless driving as part of a plea agreement, and cases from other states count. Even with a clean record, the judge has to find three things first: that you are unlikely to commit another offense, that you and the public are better served if you have no criminal record, and that supervision serves justice better than a sentence would. Aggravated DUI is a felony, and 730 ILCS 5/5-6-1 does not allow supervision for any felony.

Does Illinois Have a Lookback Period for a Second DUI?

Illinois has no lookback period for deciding whether a DUI is a felony. The DUI statute counts every prior violation, no matter how old, so a third DUI is a Class 2 felony even if the first two were decades ago. Violations in other states, under local ordinances, and on military bases all count.

Time does affect your license. If your second DUI was committed within 20 years of the first, 625 ILCS 5/6-208 does not let you apply for a new license until five years after the latest revocation. The 20 years are counted from the dates of the offenses. The criminal penalties for second and third DUI offenses have no such window. Any second violation carries at least five days in jail or 240 hours of community service, and a third carries three to seven years in prison under 730 ILCS 5/5-4.5-35.

Can a DUI Be Reduced to Reckless Driving in Illinois?

A DUI charge in Illinois can end in a plea to reckless driving if the prosecutor agrees to amend it. Reckless driving is a Class A misdemeanor under 625 ILCS 5/11-503, the same grade as a first DUI, but it is not a DUI conviction. The cost is that a reckless driving plea made under a plea agreement uses up your one chance at supervision on any later DUI.

Whether to take that reduction depends on what you are giving up. I compare it with supervision on the DUI itself, with what the State can prove, and with how each result will look on your driving record. Then you decide.

Can You Be Charged With DUI for Cannabis or a Prescription Drug in Illinois?

You can be charged with DUI in Illinois for cannabis or for a prescription drug. The DUI statute covers driving under the influence of any drug to a degree that makes you unable to drive safely. It also covers driving within two hours of having a THC concentration at or above the legal threshold. A legal right to use the substance is not a defense.

The THC threshold is set in 625 ILCS 5/11-501.2 at 5 nanograms per milliliter of whole blood, or 10 nanograms in another bodily substance. A reading at or above that level creates a legal presumption that the driver was impaired. A lower reading creates no presumption in either direction, which leaves the question to the other evidence. Registered medical cannabis patients are exempt from the two-hour concentration rule, but not if they were actually impaired. Unlawful drugs are treated differently again. Any amount of a controlled substance, an intoxicating compound, or methamphetamine in the driver’s system from unlawful use is a violation, whether or not the driver was impaired.

Can a Driver Refuse a Portable Breath Test in Illinois?

You can refuse the portable breath test an officer offers before an arrest. 625 ILCS 5/11-501.5 makes that test voluntary, and the officer uses the result to decide whether to ask for a formal chemical test. The formal test requested after an arrest is different, because refusing that breathalyzer brings a statutory summary suspension of your license.

If you do take the portable test, the same statute lets you use the result as evidence in the DUI case or at the suspension hearing.

What Makes a First DUI More Serious in Illinois?

Several facts raise the penalty for a first DUI in Illinois. An alcohol concentration of 0.16 or more adds a mandatory minimum of 100 hours of community service and a $500 fine. Having a passenger under 16 in the car exposes you to six months in jail, an additional minimum fine of $1,000, and 25 days of community service.

Other facts turn a first DUI into aggravated DUI, a Class 4 felony. They include driving without a valid license, driving a vehicle you knew or should have known was uninsured, and driving a school bus with passengers.

What Happens to a Commercial Driver’s License After an Illinois DUI Arrest?

A commercial driver can lose the commercial license after a DUI arrest, before any conviction. Under 625 ILCS 5/6-514, refusing a test or testing over the limit disqualifies you from commercial driving for at least 12 months on a first violation, and so does a first DUI conviction. The period is three years if you were hauling placarded hazardous materials, and a second violation means disqualification for life.

Keeping a commercial driving license through a DUI case also means dealing with a public record, because the privacy that protects a first offender’s summary suspension does not apply to commercial license holders.

Does an Illinois DUI Affect a Driver’s License From Another State?

An Illinois DUI can affect a license issued by another state, and how it does depends on that state. Illinois belongs to the Driver License Compact, and under 625 ILCS 5/6-703 a member state must treat an Illinois DUI conviction as if it had happened at home. Indiana is a member. Wisconsin is not, but its own law, Wis. Stat. § 343.31(2), requires Wisconsin to revoke a resident’s license on notice of a DUI conviction in another state.

Wisconsin drivers face a second issue. Supervision is not a conviction in Illinois, but Wisconsin counts it as one. The annotations to Wis. Stat. § 343.307 record a Wisconsin Court of Appeals decision, State v. List, holding that Illinois court supervision for DUI counts as a prior offense when Wisconsin charges a later one.

Whatever state you live in, an Illinois revocation stays in place until the Illinois Secretary of State lifts it. I handle out-of-state Illinois license reinstatement for drivers who never move back. Nonresidents also have one path that Illinois residents lack. After a fourth DUI, 625 ILCS 5/6-208 lets a resident of another state apply to end the revocation after 10 years, although the revocation returns if that driver later becomes an Illinois resident.

Related Practice Areas

• When a DUI carries an aggravating factor, the case moves to felony court and must pass a preliminary hearing or a grand jury, as set out under Illinois felony defense.
• Getting a license back after a DUI conviction puts the burden on the driver at a Secretary of State hearing, the process covered under revoked driver’s license reinstatement.
• A first offender’s monitoring device permit requires a breath alcohol ignition interlock device in the vehicle, installed at the driver’s own expense.

These answers describe the general rules, and your record can change any of them. I offer a free consultation on any Illinois DUI charge, and I am available 24/7. Se habla español. The number is (847) 336-3900, and the contact form for Alan E. Jones, P.C. reaches my Waukegan office.