Yes, your interlock license can be suspended in Texas, even while you're using the device

An interlock license — the restricted license that lets you drive while an ignition interlock device is installed — is not permanent protection from suspension. Texas can suspend it for violations related to the interlock itself, for new traffic offenses, or for failing to maintain the device. The suspension happens through the same process as any other license suspension, and you lose driving privileges until the suspension is lifted.

The key difference is that interlock violations often trigger automatic consequences you may not see coming. Missing a required service appointment, tampering with the device, or registering a failed breath test can all lead to suspension — sometimes without a warning first. Understanding what actions trigger suspension, and what you can do about it, keeps you from losing the limited driving rights you have.

Key Takeaways

  • The Texas Department of Public Safety can suspend your interlock license for violations like missed service appointments, device tampering, or failed breath tests.
  • A suspension for interlock violations is separate from your underlying DWI case and can happen even if you're otherwise following the terms of your restricted license.
  • You have the right to request a hearing before the suspension takes effect, but you must act within a specific timeframe after receiving notice.
  • Some interlock violations result in automatic suspension, while others give you a chance to correct the problem before suspension is imposed.

What violations trigger suspension of an interlock license

The Texas Transportation Code lists specific actions that can result in suspension. The most common are: failing or refusing a breath test on the interlock device, tampering with or attempting to circumvent the device, missing a required service or maintenance appointment, and driving a vehicle without the interlock device installed when one is required.

Less obvious violations include allowing someone else to blow into the device for you (called a "rolling retest" violation), failing to pay the interlock service provider, and not maintaining vehicle liability insurance. Some of these — like a failed breath test — are when ready red flags. Others, like a missed appointment, may seem minor but carry the same weight in the eyes of the Department of Public Safety.

The device itself records every interaction. Your service provider reports violations to the Department of Public Safety, which then decides whether to suspend your license. You don't have to be arrested or charged with a new crime for this to happen; the violation report alone is enough to trigger the suspension process.

How the suspension process works

When the Department of Public Safety receives a violation report, it sends you a notice by mail. This notice tells you what violation was reported, when it occurred, and that your license will be suspended on a specific date — usually 10 to 15 days after the notice is mailed. The notice also explains your right to request a hearing before that date.

If you do nothing, the suspension takes effect automatically on the date listed. Your license becomes invalid, and driving is illegal. If you request a hearing, the suspension is delayed while the hearing takes place. At the hearing, you can present evidence that the violation did not occur, that there's a reasonable explanation, or that the report contains errors.

The hearing is conducted by the Department of Public Safety's Administrative Law Judge section, not by a court. You can represent yourself or hire an attorney. The burden is on the Department to prove the violation occurred; you don't have to prove your innocence. If the judge finds the violation was not substantiated, the suspension is cancelled. If the violation is upheld, the suspension takes effect when ready after the hearing.

Differences between interlock suspension and DWI license suspension

Your interlock license is already a restricted version of your regular license — it's what you get after a DWI conviction or administrative suspension. A suspension of your interlock license is a separate action from the original DWI suspension. This means you can be serving your DWI suspension, get your interlock license, and then have that interlock license suspended for a violation, all at different times.

The consequences are also different. A DWI suspension typically lasts 90 days to two years depending on your case. An interlock suspension can last anywhere from 30 days to the remainder of your interlock period, depending on the violation and whether it's your first offense. If you're suspended from your interlock license, you lose the ability to drive at all — you can't fall back on a regular license because you don't have one.

If you're suspended during your interlock period, the time you spend suspended does not count toward completing your interlock requirement. If you were supposed to have the device for one year and you're suspended for three months, you still have a full year of interlock use ahead of you once the suspension is lifted.

Common reasons interlock licenses get suspended

Failed or refused breath tests are the most frequent cause of suspension. A failed test means your blood alcohol content registered above the legal limit (usually 0.025% on an interlock device, which is lower than the 0.08% limit for regular driving). A refused test — when you don't provide a breath sample — is treated the same way. Both are reported when ready by the device.

Missed service appointments happen more often than you might expect. Interlock devices require calibration and maintenance every 30 to 60 days, depending on your provider and the terms of your license restriction. If you miss an appointment and don't reschedule within a certain window, your service provider reports it as a violation. Some people miss appointments because they forget; others because they can't afford the service fee (usually $60 to $100 per visit) or can't get to the service location.

Tampering or circumvention attempts include disconnecting the device, trying to bypass it, or allowing someone else to provide the breath sample. Even an unsuccessful attempt is reported and can trigger suspension. Some people don't realize that asking a passenger to blow into the device counts as tampering.

Driving without the device happens when someone drives a vehicle that doesn't have an interlock installed, even if it's a one-time trip or an emergency. The restriction requires the device on any vehicle you operate, with no exceptions.

How to request a hearing and what to bring

The notice of suspension will include instructions for requesting a hearing. You typically have 10 to 15 days from the date the notice is mailed to submit your request. You can request a hearing by mail, phone, or online through the Department of Public Safety website. Include your driver's license number, the violation date, and a brief statement of why you believe the suspension should not take effect.

At the hearing, bring any evidence that supports your position: receipts showing you attended service appointments, a letter from your service provider explaining a scheduling error, medical records if you have a condition affecting your breath test, or documentation of vehicle repairs if the device was temporarily removed. Bring your notice of suspension and any correspondence from the Department of Public Safety.

If you believe the violation report contains factual errors — for example, the date is wrong or the device serial number doesn't match your vehicle — bring documentation proving the error. If you can show that you took reasonable steps to comply but circumstances beyond your control prevented it, explain that clearly. The judge will consider whether the violation actually occurred and whether there are mitigating factors.

What happens after suspension is lifted

Once your suspension period ends, your interlock license is automatically reinstated. You don't have to explore for reinstatement or pay a fee. However, you must still comply with all the original terms of your interlock license: the device must remain installed, you must attend all service appointments, and you must pass all breath tests.

If you were suspended for a failed breath test, that failure is part of your record. A second or third violation within your interlock period may result in a longer suspension or termination of your interlock license altogether, which would mean you lose all driving privileges until your original DWI suspension ends. Some judges or prosecutors include escalating penalties in the original interlock order, so a second violation carries a harsher consequence than the first.

Keep all documentation of your compliance — service appointment receipts, passed breath tests, insurance proof — in case you need to show a pattern of compliance if another violation is reported. If you believe a violation was reported in error, contact your service provider when ready to get their records and file a dispute with the Department of Public Safety.

Frequently Asked Questions

Can I drive at all if my interlock license is suspended?

No. Once your interlock license is suspended, you have no valid license to drive. You cannot drive any vehicle, even one without an interlock device, until the suspension is lifted. Driving during suspension is a separate criminal offense in Texas.

Do I have to pay a fee to get my interlock license back after suspension?

No fee is required to reinstate your interlock license once the suspension period ends. However, you will still owe any outstanding service fees to your interlock provider, and you must continue paying for device maintenance and monitoring as part of your original interlock order.

What if I can't afford the interlock service appointments?

Contact your service provider and explain your situation. Some providers offer payment plans or reduced fees for financial hardship. You can also request a hearing and present evidence of financial hardship to the Department of Public Safety, though this does not automatically waive the requirement or prevent suspension. Ignoring the appointment requirement will result in suspension.

Can a failed breath test on the interlock be challenged?

Yes, at your hearing you can present evidence that the test result was inaccurate — for example, medical conditions affecting breath tests, device malfunction records, or calibration errors. You can also request that the device be recalibrated and tested. However, you must act quickly; the hearing must be requested within the timeframe given in your suspension notice.

If I'm suspended from my interlock license, does that extend my DWI suspension?

No. Your interlock suspension and your original DWI suspension are separate. Time spent suspended from your interlock license does not extend your DWI suspension, but it also does not count toward completing your interlock requirement. You must complete the full interlock period once the suspension is lifted.