Chicago DUI Information

An adult passenger does not change the DUI charge itself, but a passenger under age 16 triggers a serious enhancement. Under 625 ILCS 5/11-501(c)(3), a first-offense DUI with a passenger under 16 remains a Class A misdemeanor but adds a mandatory $1,000 fine and 25 days of community service in a program benefiting children. If the DUI with a child passenger involves great bodily harm, permanent disability, or disfigurement to the child, the charge elevates to aggravated DUI under 625 ILCS 5/11-501(d)(1)(K), a Class 4 felony. A second offense involving a child passenger becomes a Class 4 felony automatically. Child-passenger DUIs are prosecuted aggressively in Cook County and often trigger DCFS involvement.

The BAIID (Breath Alcohol Ignition Interlock Device) is a court-approved breath testing device installed on the ignition system of a vehicle. Before the engine will start, the driver blows into the device and must register below a preset threshold (typically 0.025 BAC in Illinois). The unit also requires rolling retests while driving, and has a camera that photographs the driver during each test to prevent circumvention. BAIID is required for anyone driving on an MDDP or RDP after an Illinois DUI. The driver pays roughly $85 to install, plus monthly monitoring fees around $80. Any failed test, missed rolling retest, or tamper alert is reported to the Secretary of State and can extend the monitoring period or trigger revocation.

The Monitoring Device Driving Permit (MDDP) is a driving permit issued to first-time DUI offenders during the Statutory Summary Suspension period under 625 ILCS 5/6-206.1. It allows unrestricted driving privileges, meaning the driver can go anywhere and drive any time, on the condition that the vehicle is equipped with a BAIID (Breath Alcohol Ignition Interlock Device). The MDDP takes effect on day 30 of the summary suspension. To qualify, the driver must be a first-time offender, hold a valid Illinois license at the time of arrest, and not have caused death or great bodily harm. The driver pays for BAIID installation, monthly monitoring, and camera fees. Any violation resets the clock and extends the suspension.

The SR-22 is a high-risk insurance filing that Illinois requires after certain license suspensions and revocations, including DUI. It is not a policy itself but a certificate the insurance carrier files directly with the Secretary of State certifying that the driver carries the minimum liability coverage required by law. Illinois requires SR-22 filing for 36 months (three years) from the date of license reinstatement after a DUI. Any lapse in coverage during that window triggers automatic re-suspension. SR-22 policies typically cost significantly more than standard auto insurance because carriers rate the driver as high-risk. Not every carrier writes SR-22 policies, so drivers often need to shop specialty markets after a DUI reinstatement.

An Illinois DUI creates two separate legal proceedings that run on different timelines with different burdens of proof. The criminal case is prosecuted by the Cook County State's Attorney under 625 ILCS 5/11-501 and requires proof beyond a reasonable doubt. Outcomes include conviction, court supervision, or dismissal, with penalties like fines, jail, and probation. The administrative case is run by the Illinois Secretary of State under 625 ILCS 5/11-501.1 and controls driving privileges. It only requires probable cause and produces the Statutory Summary Suspension. A driver can beat the criminal case and still lose their license through the administrative track, or vice versa. Both cases require independent attention, and the deadlines for challenging each are different.

A first-time Illinois DUI runs through two parallel processes. The criminal case starts with arrest, bond, and arraignment in the Cook County Circuit Court, followed by pretrial motions, discovery, and either a plea, bench trial, or jury trial under 625 ILCS 5/11-501. The administrative case triggers the Statutory Summary Suspension on day 46, which the driver can challenge by filing a Petition to Rescind under 625 ILCS 5/2-118.1. First-time offenders are typically eligible for court supervision under 730 ILCS 5/5-6-1(c), which avoids a formal conviction if all conditions are met. Required conditions include an alcohol evaluation, DUI risk education, community service, victim impact panel attendance, and successful completion of the supervision period.

The Illinois legal BAC limit for a standard non-commercial driver over age 21 is 0.08 under 625 ILCS 5/11-501(a)(1). At 0.08 or above, the state can secure a DUI conviction based on the number alone, without proving actual impairment. Commercial drivers face a lower limit of 0.04 under 625 ILCS 5/6-515. Drivers under 21 are subject to zero tolerance under 625 ILCS 5/11-501.8, meaning any measurable alcohol (0.00 to 0.08) triggers license suspension even without a DUI conviction. Illinois also has a high-BAC enhancement at 0.16 or above, which adds mandatory minimum jail or community service to a first-offense conviction. Refusal to submit to testing triggers a separate 12-month suspension.

625 ILCS 5/11-501 is the core Illinois DUI statute. It defines driving under the influence in six separate ways: driving with a BAC of 0.08 or higher, driving under the influence of alcohol to a degree that renders the driver incapable of safely driving, driving under the influence of any intoxicating compound, driving under the influence of any drug or combination of drugs, driving with any amount of a controlled substance in the person's blood or urine, and driving with a THC concentration of 5 nanograms per milliliter of blood or 10 nanograms per milliliter of other bodily substance. A person can be convicted under any of these subsections independently, which means a DUI conviction does not require a BAC test at all.