Interlock Device Violations: What Happens Next

You're on the interlock program, doing everything right—then you get a violation. Maybe you failed a test after using mouthwash. Maybe you missed a service appointment. Maybe the device malfunctioned.

Whatever happened, a violation feels catastrophic. But it doesn't have to destroy your reinstatement. Here's what actually happens and how to handle it.

Types of Interlock Violations

Not all violations are equal. Understanding what triggered yours matters:

Positive Alcohol Tests

• Startup failure: You blow into the device before starting the car and register alcohol above the threshold (usually 0.02-0.04 BAC).
• Rolling retest failure: While driving, the device requests a retest and you fail.
• High BAC reading: Some violations are more serious at higher BAC levels.

Tampering or Circumvention

• Bypass attempts: Evidence that someone tried to start the car without using the device properly.
• Disconnection: The device logs any power interruptions or disconnections.
• Having someone else blow: Cameras on newer devices can detect this.

Administrative Violations

• Missed service appointment: Most states require service every 30-60 days for data download.
• Late calibration: The device needs regular calibration to function properly.
• Failure to report vehicle issues: Battery problems, accidents, etc.

What Happens After a Violation

The process varies by state, but generally:

1. Device records the event: Everything is logged—date, time, BAC reading, and often a photo.
2. Data download at service: When you bring the device for service, all data is downloaded and transmitted to the monitoring authority.
3. Authority reviews: The DMV, court, or monitoring agency reviews violation reports.
4. Notice issued: You receive notification of the violation and any consequences.
5. Possible hearing: Some violations trigger a hearing where you can explain or contest.

Consequences of Violations

IID Period Extension

The most common consequence is extending your interlock requirement. A single violation might add 3-6 months. Multiple violations can add a year or more. Your path to full license reinstatement gets longer.

License Revocation

Serious violations—especially multiple positive tests or tampering—can result in your restricted license being revoked entirely. You're back to not driving at all.

Probation Violation

If you're on probation for DUI, an interlock violation may constitute a probation violation. This can trigger criminal penalties beyond just license consequences.

Program Removal

In some states, enough violations result in removal from the interlock program entirely—which doesn't mean you get your license back. It means you lose even restricted driving privileges.

How to Respond to a Violation

1. Don't Panic

A single violation—especially one you can explain—isn't necessarily fatal to your reinstatement. How you respond matters.

2. Document Everything

If you believe the violation was erroneous, document your explanation immediately:

• What did you eat or drink before the test?
• Were you using any medications?
• Was there a device malfunction?
• Did you immediately retest (and pass)?

3. Request a Hearing (If Available)

Most states allow you to contest violations. Request a hearing promptly—there's usually a deadline. At the hearing, you can present evidence that the violation was a false positive or technical error.

4. Get Documentation from the Service Provider

If the device malfunctioned, get documentation from the interlock company. Their records may show device errors or calibration issues.

5. Consult an Attorney

For serious violations or multiple violations, consult a DUI attorney. They can advise on your best options and represent you at hearings.

Common False Positive Causes

Interlock devices are sensitive. These can cause false positives:

• Mouthwash: Many contain alcohol. Rinse with water and wait 15+ minutes before testing.
• Hand sanitizer: Alcohol vapors from recent application can trigger false readings.
• Certain foods: Bread, pastries, and fermented foods can produce trace alcohol.
• Energy drinks: Some contain ingredients that trigger the device.
• Medications: Cough syrup, liquid medicines, and some prescriptions contain alcohol.
• Diabetes: Diabetic ketoacidosis can produce acetone that some devices read as alcohol.

If you fail a test, immediately rinse your mouth with water and request a retest. Most devices allow retesting after a brief wait. A pattern of initial failure followed by immediate passing suggests a false positive, not actual intoxication.

Preventing Future Violations

• Know your device: Read the manual. Understand how it works and what triggers it.
• Avoid alcohol-containing products: Switch to alcohol-free mouthwash and hand sanitizer.
• Wait before testing: Don't eat or drink anything for 15 minutes before a test.
• Keep service appointments: Set calendar reminders. Never miss one.
• Report problems immediately: Device issues, battery problems, accidents—report them all.
• Keep records: Save all receipts, reports, and communications related to your interlock.

What If You Were Actually Drinking?

If the violation is legitimate—you actually had alcohol in your system—you have a serious problem. This suggests the underlying issue that led to your DUI hasn't been addressed.

Consider:

• Entering or continuing treatment
• Attending AA or similar support groups
• Talking to a counselor about what's driving the behavior

Trying to game the system while continuing to drink won't work. You'll accumulate violations, lose your license entirely, and potentially face new criminal charges.

Moving Forward

One violation doesn't end your reinstatement journey. Many people have had false positives, explained them at hearings, and continued successfully. The key is responding appropriately: document, contest if warranted, and prevent future issues.

But multiple violations—especially legitimate ones—signal that something needs to change. The interlock program exists because courts determined you needed monitoring. Proving them right by violating repeatedly makes your situation much worse.