Should I Refuse a Breath Test in Illinois After a DUI Arrest.

The Question Everyone Asks at 2 AM

You are sitting on the side of the road. Blue lights behind you. An officer asking you to step out of the vehicle.  You know it looks like you might get a DUI. And somewhere in your mind, you are asking yourself:

Should I blow into that thing or not?

I get asked this question more than any other. As a former felony prosecutor who now defends DUI cases across Will County and DuPage County, I have been on both sides of this issue in courtrooms for years.

Here is my honest answer — not the answer designed to make you feel better, just the truth.

In most circumstances, refusing the breath test is the strategically correct decision.

Let me explain exactly why — and the important exceptions.

What Illinois Implied Consent Law Actually Says

Under 625 ILCS 5/11-501.1, Illinois operates under an implied consent law. This means that by driving on Illinois roads, you have implicitly agreed to submit to chemical testing — breath, blood, or urine — if a police officer has probable cause to believe you are driving under the influence and lawfully arrests you, your license can be suspended based on what you do at the station or hospital. Refuse, your suspension is longer – 12 months or 3 years.  Agree, your suspension is only 6 months or 1 year, if you test over the legal limit or positive for illicit drugs or excessive amounts of cannabis.

The key phrase there is lawfully arrests you. The implied consent obligation does not kick in at a traffic stop. It does not apply to a field sobriety test. It applies following a lawful arrest fora  DUI and when other procedures are followed.

There is no law requiring you to submit to the test. What the law does is attach consequences to refusal.

What Happens If You Refuse

If you refuse a breath test after an  Illinois DUI arrest, the Illinois Secretary of State automatically issues a statutory summary suspension:

• First-time refusal: 12-month suspension of driving privileges
• Refusal with prior DUI (arrest or disposition) within 5 years: 3-year suspension

This suspension is separate from your criminal DUI case and takes effect automatically on the 46th day after your arrest unless you successfully petition to rescind it. You have 90 days from the date of arrest to file that petition to rescind.

The refusal is also admissible at trial. A prosecutor can tell the jury that you refused the breath test — and argue that refusal indicates consciousness of guilt.

These are real consequences. Anyone who tells you refusal is consequence-free is not being straight with you.

But here is the other side of the ledger.

The Strategic Case for Refusing

You Eliminate the Prosecution’s Strongest Evidence

In an Illinois DUI trial, the breath test result is almost always the prosecution’s most powerful piece of evidence. A number — .12, .15, .18 — printed on a certified machine carries enormous weight with juries. It feels objective, scientific, and definitive.

When you refuse, you eliminate that number entirely. The prosecution must prove impairment using only officer observations, field sobriety test performance, and physical indicators. That is a much harder case to make beyond a reasonable doubt.

To be fair, a positive test is not fatal in every case, but it does hurt a lot.  There are times we can challenge the test- breath testing machines have calibration requirements, maintenance schedules, and operator certification requirements. Results can be challenged. But challenging a breath test result at trial, judge or jury, is vastly harder than fighting a case that has no breath test result at all.

Our Results Bear This Out

In our five Will County DUI victories in February 2026, four clients refused chemical testing. Here is what happened:

• Joliet — McDonald’s drive-thru: Refused all testing. Passed out behind the wheel of a running vehicle. Not Guilty.
• Park Forest — “I need to sober up”: Refused breath test. Maximum HGN impairment score. Verbal admission of needing to sober up. Not Guilty.
• Romeoville — 117 MPH CDL driver: Refused breath test. Showed physical signs of intoxication. 12-month CDL suspension rescinded.
• Plainfield — Route 59: Charges dismissed based on lack of probable cause. 3-year suspension dismissed.

In none of these cases did the refusal result in conviction. In each case, the absence of a breath test result was a significant factor in the defense.

The Suspension Is Fightable

The 12-month summary suspension triggered by refusal is not a certainty. It can be rescinded at a suspension hearing — a completely separate proceeding from your criminal case. In the Romeoville case, we rescinded a 12-month CDL suspension because the State failed to meet its own 30-day deadline. The suspension disappears. The CDL career was saved.

Even if the suspension is not rescinded, you may be eligible for relief during the suspension period. An experienced attorney can evaluate your eligibility for a Monitoring Device Driving Permit (MDDP) or other relief.  If its your first DUI arrest, you can drive during the period of suspension.

A Refusal Is Not a Confession

Yes, the prosecution can tell the jury you refused. But your attorney can also address that directly. People refuse tests for many reasons — medical conditions, distrust of equipment accuracy, exercise of constitutional rights, following advice of counsel. The refusal alone does not make you guilty. The State still has to prove its case.

When Refusing May Not Be the Right Move

This is almost impossible to give a broad answer.  Broadly speaking, always refuse.  The decision to not refuse cannot be distilled down to one paragraph.  Its something that has to be decided at the moment, when you can’t access your phone or call your lawyer.

If your BAC is likely to be very low. If you genuinely had one or two drinks several hours earlier and feel confident your BAC is well below .08, taking the test and producing a low result can support your defense. The risk is miscalculation — people consistently underestimate their BAC – and alcohol impairs judgment.  Best to not try to calculate and avoid the risk entirely.  Also, when the officer arrests you for DUI and you test under, they are going to ask for blood and urine – which will reveal other substances that are not easily seen during a DUI investigation. Its a classic “out of the frying pan into the fire” situation. The police won’t like having egg on their face for arresting someone who tests a .03 or .05 – he is going to overcompensate by turning this into a DUI Drugs fishing expedition.

If you are a CDL holder and the 12-month disqualification would end your career. For some commercial drivers, a 12-month CDL disqualification is professionally catastrophic — more so than the criminal charge itself. In those situations, the calculus may shift depending on the specific facts of your stop. A refusal or testing over the legal limit leads to the disqualification.  However, a disposition or guilty finding on a DUI has the same affect. If you refuse, beat your DUI, but lose your CDL for a year – is that better than losing your DUI, losing your CDL for a year, and having the DUI follow your CDL forever?

At the end of it all these are judgment calls that require an attorney. If you have any opportunity to call a lawyer before submitting to or refusing a test, do it. That call takes minutes and can change everything.

What About the Roadside Breathalyzer — the PBT?

There are two separate breath tests in an Illinois DUI investigation, and confusing them is a common and costly mistake.

The Preliminary Breath Test (PBT) is the small handheld device the officer uses at the side of the road before making an arrest decision. The PBT result is not admissible as evidence of your BAC at trial. Officers use it only to help establish probable cause for arrest.

You CAN AND SHOULD refuse the PBT. There is no criminal penalty for refusing it, though refusal may be noted in the police report and may affect the officer’s probable cause determination.

The Evidentiary Breath Test is the certified machine at the police station — the Intoxilyzer or DataMaster. This result is admissible at trial. This is the test that triggers the summary suspension if refused. This is the test we are discussing throughout this article.

Do not confuse the two. Refusing the PBT at the roadside is very different legally from refusing the evidentiary test at the station.  Both should be refused.

I Already Refused — What Do I Do Now?

First — do not panic. Refusal does not mean conviction, and it does not mean your suspension is permanent.

Here is what needs to happen immediately:

1. Contact a DUI defense attorney right now. The suspension clock is already running. You have 90 days from the date of arrest to file a petition to rescind the summary suspension. The sooner we get involved, the more options you have.

2. Do not discuss your case with anyone. Not friends, not family, not on social media. Everything you say can be used against you in both the criminal case and the suspension hearing.

3. Document everything while it is fresh. Write down exactly what happened — where you were stopped, what the officer said, what you said, the sequence of events, road conditions, lighting, and anything else you remember. This information is critical to building your defense.

4. Request body camera footage immediately. Body camera footage is often the best defense evidence available — but it is frequently overwritten or lost if not preserved quickly. Your attorney can send a preservation demand.

We handle summary suspension rescission hearings across Will County and DuPage County. Call us: 📞 (815) 717-4015

I Already Took the Test — What Do I Do Now?

Taking the breath test does not end your defense options. Not by a long shot.

The result can be suppressed. If the officer lacked probable cause to arrest you before administering the breath test, a motion to suppress can exclude the result entirely — exactly as we did in the I-55 case where our client blew .086 and was found not guilty on all five charges.

The result can be challenged. Breath testing machines require regular calibration and maintenance. Officers must be properly certified to administer tests. Procedural requirements must be followed. Deficiencies in any of these areas provide grounds to challenge the result’s reliability.

The result is just one piece of evidence. Even a breath test result over .08 does not guarantee conviction. The State still must prove you were operating the vehicle, that the test was properly administered, and that the result accurately reflects your BAC at the time of driving — not just at the time of testing.

Call us and we will evaluate every angle: 📞 (815) 717-4015

The Bottom Line

Refusing the breath test in Illinois costs you 12 months of driving privileges if the suspension holds. Submitting to it and producing a result over .08 gives the prosecution their most powerful evidence against you.

For most people, in most situations: refuse the test.

But the best answer for your specific situation depends on factors only an attorney can evaluate after hearing the facts of your case. If you have any ability to make a phone call before deciding, make it.

And if you have already been arrested — whether you refused or submitted — call us now. Your case is not over.

📞 (815) 717-4015

Schedule your free consultation →

Read about our recent results: 5 Will County DUI Victories — Including 4 Cases Where Clients Refused Testing

The Law Offices of Neil Patel
Joliet (Will County) | Wheaton (DuPage County)
We don’t sell fear. We tell the truth. And we win cases.

We Handle All Illinois DUI-Related Matters:

• DUI Defense — First Offense, Second Offense, Aggravated DUI
• CDL / Commercial Driver DUI Defense
• Statutory Summary Suspension Rescission Hearings
• Motion to Suppress (challenging illegal stops and arrests)
• Aggravated Speeding
• Traffic Violations
• License Reinstatement

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Attorney Advertising. Prior results do not guarantee a similar outcome. Each case is unique and must be evaluated on its own facts and circumstances. The information on this page is for general informational purposes only and does not constitute legal advice. Consult with a qualified DUI defense attorney regarding your specific situation.