What Happens If You Fail a Breathalyzer Test?

 Posted on November 08, 2026 in DUI

Failing an official Illinois breath test can lead to a DUI charge and a separate license suspension. A result of 0.08% or higher can trigger a statutory summary suspension before the criminal case ends. If you’re facing a charge after failing a breath test in 2026, our Orland Park, IL DUI defense lawyer can review the result and explain your options.

Does Failing a Breathalyzer Automatically Suspend Your Illinois License?

Not every breath test has the same effect. A portable roadside test helps police investigate DUI, but that preliminary reading alone does not trigger a statutory summary suspension.

Under 625 ILCS 5/11-501.1, an official breath test result of 0.08% or higher after a DUI arrest can trigger a license suspension. For a first offender under Illinois suspension rules, the suspension lasts six months for failing the test or one year for refusing it. Drivers with qualifying prior offenses face longer periods.

The suspension begins on day 46 after notice, regardless of the criminal case's outcome. Even if the criminal charge is dismissed, the administrative suspension can remain in place unless it is separately overturned. The criminal case and license challenge are separate matters.

How Long Do You Have to Challenge an Illinois DUI License Suspension?

Under 625 ILCS 5/2-118.1, you have 90 days after receiving the suspension notice to ask for a hearing in writing. The court usually has 30 days to hold the hearing once you file the request and properly notify prosecutors. Filing does not automatically stop the suspension from taking effect.

Your lawyer can challenge the arrest, warnings, and testing procedures. Filing early improves the chance of a hearing before day 46. Waiting can leave you unable to drive while the challenge proceeds.

Can You Drive During a DUI Suspension in Illinois?

Some first offenders qualify for a Monitoring Device Driving Permit (MDDP). The permit allows driving in vehicles fitted with a breath alcohol ignition interlock device. The device requires a breath sample before the engine starts. Permit holders must follow its rules and pay applicable fees. Driving without a required device can lead to further penalties and loss of the permit.

An invalid license, certain serious crashes, or prior DUI history can prevent eligibility. The permit does not restore ordinary driving privileges. You usually need an approved device in every vehicle you drive under the permit. You can ask for an exception for certain vehicles your employer owns. 

Can Illinois Breathalyzer Results Be Wrong or Challenged?

Breath test results are evidence, not a finding of guilt. Illinois requires trained operators, approved testing instruments, and specific procedures for official breath testing. Under Illinois testing rules, the test operator or another agency employee must watch you for at least 20 minutes straight before you give a breath sample. The test requires one valid breath reading, not two separate samples.

Instruments also require accuracy checks. Missed checks or observation problems raise questions but do not automatically invalidate results. Mouth alcohol or medical conditions are also important when supported by evidence. Video and testing records help show whether officers followed required steps. An attorney can compare the report with what the footage actually shows.

What Evidence Can Help Fight a Failed Breathalyzer Test in Illinois?

An attorney can examine the records behind the result, including:

• Instrument accuracy checks, maintenance logs, and test printouts

• The operator's training and certification

• Booking and police video showing the observation period

• The timing of driving, arrest, and testing

• Evidence about the stop and the reason for arrest

Alcohol levels can change before testing. If the stop or arrest was unlawful, your lawyer can seek to suppress evidence. 

What Penalties Follow a First DUI Conviction in Illinois?

An ordinary first DUI is a Class A misdemeanor. A conviction can bring up to 364 days in jail and a fine of up to $2,500. It also results in driver's license revocation, which is different from the temporary statutory summary suspension. Revocation does not simply end on a preset date. Restoring driving privileges requires additional steps.

Eligible first offenders can receive court supervision, which allows them to avoid a conviction by completing certain court requirements. These include an alcohol evaluation, treatment, or community service. DUI supervision is available only once in a lifetime in Illinois, and the record cannot ordinarily be expunged or sealed. A third DUI is a felony, while having a child passenger during a first DUI can lead to additional penalties without automatically making the offense a felony.

Contact Our Orland Park, IL DUI Defense Attorney Today

If you failed a breath test in 2026, prompt legal advice can help protect your license and defense options. Attorney Kal Issa has handled more than 100 contested matters, including motions and trials. He can review testing records and represent you in criminal and suspension proceedings.

Contact Issa Law, LLC at 708-966-2408 to speak with our Orland Park, IL DUI defense lawyer today.