Last updated: September 9, 2026
Quick Answer
625 ILCS 5/11-501 is the Illinois statute that makes it a criminal offense to operate a motor vehicle while impaired by alcohol, drugs, or any intoxicating compound. A blood alcohol concentration (BAC) of 0.08% or higher triggers a per se violation, but a driver can also be charged based on impairment alone, regardless of BAC. Penalties range from a Class A misdemeanor for a first offense to a felony for repeat or aggravated violations.
Key Takeaways
- Illinois law prohibits driving with a BAC of 0.08% or higher, or while impaired by any substance including prescription drugs.
- A DUI conviction in Illinois is a lifetime lookback offense, it stays on your driving record permanently.
- First-offense DUI is typically a Class A misdemeanor, punishable by up to 364 days in jail and fines up to $2,500.
- A third or subsequent DUI becomes a felony, carrying potential prison time and long-term license revocation.
- Refusing a breathalyzer triggers an automatic statutory summary suspension of your license under Illinois’ implied consent law.
- You can be charged with DUI without a breathalyzer test, field sobriety tests and officer observations are sufficient probable cause.
- Prescription medication impairment is treated the same as alcohol impairment under Illinois law.
- A DUI conviction triggers a mandatory minimum license suspension and may require an ignition interlock device.
- Several legal defenses exist, including challenging the traffic stop, the reliability of chemical tests, and chain of custody.
- Illinois DUI law is entirely state-level; there is no separate federal DUI statute for ordinary roads.
What Does 625 ILCS 5/11-501 Actually Mean?
Section 11-501 of the Illinois Vehicle Code makes it unlawful for any person to drive or be in actual physical control of a motor vehicle within Illinois while impaired. The statute covers multiple theories of impairment, not just alcohol.
Specifically, a person violates the statute if they:
- Have a BAC of 0.08% or more (alcohol)
- Are under the influence of alcohol to a degree that renders them incapable of safe driving
- Are under the influence of any other drug or combination of drugs to a degree that renders them incapable of safe driving
- Have any amount of a controlled substance listed in the Illinois Controlled Substances Act in their blood or urine (a zero-tolerance standard for illegal drugs)
- Are under the influence of any intoxicating compound or combination of compounds
Edge case: “Actual physical control” matters. A driver parked in a lot with the engine running can be charged under 625 ILCS 5/11-501 even if the vehicle never moved.
What Is the Legal Blood Alcohol Limit Under Illinois DUI Law?
The standard legal limit is 0.08% BAC for drivers aged 21 and over. However, the statute sets stricter limits for specific groups.
| Driver Category | BAC Limit |
|---|---|
| Standard adult driver (21+) | 0.08% |
| Commercial vehicle driver (CDL) | 0.04% |
| Driver under age 21 | 0.00% (zero tolerance) |
| School bus driver | 0.00% |
Illinois also has a proposed measure that would lower the standard limit to 0.05% BAC, see the detailed breakdown in this article on Illinois’ proposed 0.05 BAC law for the current legislative status.
Important: Even below 0.08%, a driver can still be charged if an officer can establish impairment through observed behavior, field sobriety tests, or other evidence.
How Is 625 ILCS 5/11-501 Different From Federal DUI Laws?
Illinois DUI law is a state statute; there is no general federal DUI law that applies to ordinary public roads. The federal government only has direct jurisdiction over driving on federal property (military bases, national parks, and similar locations), where the Assimilative Crimes Act or specific federal regulations apply.
For everyday drivers on Illinois roads, 625 ILCS 5/11-501 is the controlling law. Federal law does indirectly influence DUI enforcement through:
- Federal highway funding incentives that pushed states to adopt the 0.08% BAC standard
- Commercial driver regulations under the Federal Motor Carrier Safety Administration (FMCSA), which set the 0.04% CDL limit
- Federal drug schedules, which Illinois incorporates by reference in its controlled substances provisions
Practical takeaway: If you’re charged with DUI on an Illinois public road, your case is governed entirely by state law and prosecuted in Illinois state court.
What Are the Penalties for Violating 625 ILCS 5/11-501?
Penalties escalate sharply with each offense and with aggravating factors. For a complete breakdown, see the Illinois DUI penalties explained guide.
First offense (Class A misdemeanor):
- Up to 364 days in jail
- Fines up to $2,500 (plus mandatory court costs and assessments)
- Minimum 1-year license revocation
- Mandatory community service in some circumstances
Second offense (Class A misdemeanor, mandatory minimum jail):
- Mandatory minimum 5 days in jail or 240 hours of community service
- Minimum 5-year license revocation if within 20 years of first offense
Third and subsequent offenses (felony):
- Third offense: Class 2 felony (3-7 years in prison)
- Aggravating factors (child passenger, school zone, prior reckless homicide) can elevate the charge further
For context on how Illinois classifies felony offenses, the guide to felony classes in Illinois explains the full sentencing tier structure.
Aggravating factors that increase penalties include:
- Passenger under age 16 in the vehicle
- BAC of 0.16% or higher
- Driving in a school zone
- Causing bodily harm or death
- Prior DUI convictions
Can You Get a DUI Under 625 ILCS 5/11-501 Without a Breathalyzer Test?
Yes. A breathalyzer result is not required for a DUI conviction in Illinois. Prosecutors can build a case using:
- Officer observations (slurred speech, bloodshot eyes, odor of alcohol)
- Field sobriety test results (walk-and-turn, one-leg stand, horizontal gaze nystagmus)
- Dashcam or bodycam footage
- Witness statements
- Blood or urine test results from a hospital
Common mistake: Many drivers assume that refusing the breathalyzer means there’s no case. In reality, refusal triggers an automatic statutory summary suspension and can be presented to a jury as evidence of consciousness of guilt.
Can You Refuse a Sobriety Test Under 625 ILCS 5/11-501?
Under Illinois’ implied consent law (also found in 625 ILCS 5/11-501.1), any person who drives on Illinois roads is deemed to have consented to chemical testing. Refusing a properly requested chemical test results in:
- A 12-month statutory summary suspension for a first refusal (versus 6 months for a failed test)
- A 36-month suspension for a second or subsequent refusal within 5 years
You do have the right to refuse field sobriety tests (the physical roadside tests) without a direct license penalty, though refusal can still be noted by the officer and used in court. For more on what happens to your license, see DUI in Illinois: will my driver’s license be suspended?
What Counts as Driving Under the Influence in Illinois?
Under 625 ILCS 5/11-501 explained fully, “driving under the influence” covers far more than alcohol. Illinois law treats the following as DUI:
- Alcohol impairment at or above 0.08% BAC, or any impairment affecting safe driving ability
- Cannabis impairment, despite legalization, driving while impaired by marijuana is still a DUI offense; there is a 5 nanograms per milliliter THC blood limit for drivers 21 and over (see key changes in Illinois marijuana laws)
- Prescription drug impairment, a valid prescription is not a defense if the drug impairs driving ability
- Over-the-counter drug impairment, antihistamines, sleep aids, and similar compounds are covered
- Controlled substances, any detectable amount of an illegal drug in blood or urine, regardless of observed impairment
Can You Get a DUI on Prescription Medications Under Illinois Law?
Yes. Illinois law explicitly includes prescription and over-the-counter medications under the DUI statute. A valid prescription does not shield a driver from prosecution if the medication impairs their ability to drive safely.
Choose this defense if: The medication was taken exactly as prescribed, there was no warning label about driving impairment, and no observable impairment was documented by the officer. An expert pharmacologist or toxicologist can be called to testify about the drug’s effects at the detected concentration.
Drivers taking medications that affect cognition, reaction time, or coordination should consult their physician about driving safety and keep documentation of their prescription in case of a stop.
What’s the Difference Between a First and Second DUI Offense Under Illinois Law?
The distinction between a first and second DUI offense under 625 ILCS 5/11-501 is significant in terms of mandatory minimums and license consequences.
| Factor | First Offense | Second Offense |
|---|---|---|
| Classification | Class A misdemeanor | Class A misdemeanor |
| Mandatory jail | None (probation possible) | 5 days minimum or 240 hrs community service |
| License revocation | 1 year minimum | 5 years (if within 20 years of first) |
| MDDP/BAIID eligibility | Yes, after 31-day hard suspension | Limited |
| Felony risk | No (absent aggravators) | No (unless third or more) |
For a detailed look at what first-time offenders face specifically, see first offense DUI Illinois: know the charges you face.
How Long Does a DUI Conviction Stay on Your Record in Illinois?
A DUI conviction in Illinois stays on your driving record permanently. Illinois has no expungement provision for DUI convictions, and the Secretary of State’s office maintains a lifetime record for purposes of calculating repeat offenses and license sanctions.
This lifetime lookback means a DUI from 20 or 30 years ago still counts when determining whether a new charge is a second, third, or subsequent offense. For context on how long criminal records generally persist, the statute of limitations in Illinois guide covers related record-keeping timelines.
Note: A first-offense DUI that was disposed of under 730 ILCS 5/5-6-3.3 (the supervision statute) and successfully completed may be eligible for expungement of the court record, but the Secretary of State’s driving record entry remains.
What Happens to Your Driver’s License After a DUI Conviction in Illinois?
A DUI conviction triggers two separate license actions that often confuse drivers:
- Statutory Summary Suspension (SSS): An administrative suspension that begins 46 days after notice, even before conviction. This is a civil action by the Secretary of State.
- Revocation upon conviction: A criminal court conviction results in a mandatory license revocation, which requires a formal hearing before reinstatement.
For in-depth information on the revocation process, the article on lifetime driver’s license revocation in Illinois explains the most severe end of the spectrum.
During a first-offense suspension, a driver may be eligible for a Monitoring Device Driving Permit (MDDP), which requires an ignition interlock (BAIID) device installed in the vehicle.
What Should You Do If You’re Pulled Over for Suspected DUI in Illinois?
The steps taken during a traffic stop directly affect the outcome of any subsequent case. Here is a practical sequence:
- Pull over safely and promptly, erratic stopping behavior is documented.
- Provide license, registration, and insurance, you are legally required to do so.
- Remain calm and polite, do not argue or volunteer information.
- Decline field sobriety tests, you have the right to refuse without a direct license penalty.
- Be aware of implied consent, refusing a chemical test (breath, blood, urine) triggers an automatic suspension.
- Request an attorney, once arrested, clearly invoke your right to counsel before answering substantive questions.
- Document everything you can remember, time, location, officer’s statements, test conditions, as soon as possible after the stop.
For guidance on when to bring in legal help, see when you should hire a criminal defense attorney.
Are There Any Defenses to a DUI Charge Under Illinois Statute 11-501?
Several defenses are available, and their viability depends on the specific facts of the stop and arrest.
Common defenses include:
- Unlawful traffic stop: If the officer lacked reasonable articulable suspicion to stop the vehicle, all evidence gathered afterward may be suppressed.
- Improper administration of field sobriety tests: The National Highway Traffic Safety Administration (NHTSA) sets specific protocols; deviation can undermine test results.
- Breathalyzer calibration and maintenance: Breath test machines must be regularly calibrated and maintained per Illinois State Police regulations; records are discoverable.
- Rising BAC defense: BAC at the time of driving may have been below 0.08% if alcohol was still being absorbed at the time of the stop.
- Medical conditions: Certain conditions (GERD, diabetes, neurological disorders) can affect breath test readings or mimic impairment.
- Chain of custody issues: Blood or urine samples must be properly collected, stored, and tested.
Edge case: If the arresting officer failed to read proper warnings before a chemical test request, the suspension may be rescindable at a hearing.
How Much Does It Cost to Fight a DUI Charge in Illinois?
The total cost of a DUI defense in Illinois varies widely based on the complexity of the case, the attorney’s experience, and whether the case goes to trial.
Typical cost ranges (estimates based on general market data for Illinois, 2026):
- Attorney fees, first-offense plea: $1,500,$5,000
- Attorney fees, contested first offense (trial): $5,000,$15,000+
- Attorney fees, felony DUI: $10,000,$30,000+
- Fines and court costs: $2,500+ in fines, plus mandatory assessments that can add $1,000,$2,000
- BAIID device installation and monitoring: Approximately $80,$150 per month
- DUI evaluation and treatment programs: $150,$500+
- License reinstatement fees: Varies by offense history
The cost of not fighting a charge is also significant: a conviction means permanent record, higher insurance premiums (often $1,000,$3,000 per year more), and potential employment consequences.
FAQ
Q: What does “actual physical control” mean under 625 ILCS 5/11-501? A: It means a person can be charged with DUI even if the vehicle was not moving. Sitting in the driver’s seat with the keys in the ignition, even while parked, can constitute actual physical control under Illinois law.
Q: Can a first-time DUI be expunged in Illinois? A: A first-offense DUI conviction cannot be expunged from the Secretary of State’s driving record. However, if the charge was resolved through court supervision (not a conviction), the court record may be eligible for expungement after successful completion.
Q: Does a DUI in another state count as a prior offense in Illinois? A: Yes. Illinois recognizes out-of-state DUI convictions for purposes of determining whether a new charge is a second or subsequent offense.
Q: Is a DUI a felony in Illinois? A: A first or second DUI is generally a Class A misdemeanor. A third or subsequent DUI, or any DUI with certain aggravating factors (such as causing great bodily harm or having a child passenger), is charged as a felony.
Q: Can passengers be charged under 625 ILCS 5/11-501? A: No. The statute applies only to the person operating or in actual physical control of the vehicle. Passengers cannot be charged under this specific statute.
Q: Does Illinois have a “per se” drug DUI law? A: Yes. Any detectable amount of a controlled substance in a driver’s blood or urine is a per se violation, regardless of whether the driver appeared impaired. This is a stricter standard than the alcohol BAC threshold.
Q: What is a BAIID device and when is it required? A: A Breath Alcohol Ignition Interlock Device (BAIID) is a breathalyzer connected to a vehicle’s ignition. It is required for drivers seeking a Monitoring Device Driving Permit during a statutory summary suspension and for reinstatement after certain DUI convictions.
Q: Can a DUI charge be reduced to reckless driving in Illinois? A: In some cases, prosecutors may agree to reduce a DUI charge to reckless driving (sometimes called a “wet reckless”) through plea negotiation. This is more common for first-time offenders with no aggravating factors, but it is not guaranteed and depends on the specific facts and the prosecutor’s discretion.
Q: How long is the statutory summary suspension for a first offense? A: Six months for a failed chemical test, or 12 months for refusing a chemical test, for a first-time offender with no prior DUI within 5 years.
Q: Does a DUI affect professional licenses in Illinois? A: Potentially yes. Many professional licensing boards (medical, legal, nursing, teaching) require disclosure of criminal charges and convictions. A DUI conviction can trigger a review and possible disciplinary action by the relevant licensing authority.
Conclusion
Understanding 625 ILCS 5/11-501 explained fully means recognizing that Illinois’ DUI statute reaches well beyond a simple breathalyzer reading. The law covers alcohol, illegal drugs, prescription medications, and cannabis, and it applies even when a vehicle isn’t moving. Penalties escalate steeply with each offense, and a conviction stays on your driving record for life.
Actionable next steps if you or someone you know faces a DUI charge:
- Do not delay, the 90-day window to challenge a statutory summary suspension is strict and unforgiving.
- Consult a qualified Illinois DUI attorney before your first court date; early intervention often produces better outcomes.
- Gather documentation, obtain the police report, dashcam footage, and any witness contact information as soon as possible.
- Understand your license status, determine whether a Monitoring Device Driving Permit is available so you can continue driving during the suspension period.
- Review the full consequences at understanding the consequences of DUI arrest in Illinois and the complete guide to navigating the DUI process in Illinois.
The stakes of a DUI charge in Illinois are high enough that informed action, taken quickly, makes a measurable difference.
References
- Illinois General Assembly. 625 ILCS 5/11-501, Illinois Vehicle Code, Chapter 11, Article V. ilga.gov. https://www.ilga.gov/legislation/ilcs/fulltext.asp?Name=0625000050K11-501
- Illinois Secretary of State. DUI Fact Book. cyberdriveillinois.com. (2023)
- National Highway Traffic Safety Administration. Standardized Field Sobriety Testing. nhtsa.gov. (2018)
- Illinois Secretary of State. Monitoring Device Driving Permit Program. ilsos.gov. (2022)
- Federal Motor Carrier Safety Administration. Drug and Alcohol Testing Regulations, 49 CFR Part 382. fmcsa.dot.gov. (2022)
