Vermont Ignition Interlock Device After a DUI: Requirements, Costs, and Compliance

Vermont requires a camera-equipped ignition interlock device for any driver who wants to regain restricted driving privileges after a DUI. That camera requirement is unusual — most states only require the breath sensor. It means someone cannot have another person blow into the device on their behalf, and it means every startup and retest attempt is photographically documented.

Here is how the interlock program works in practice: what it costs, how long it lasts, what triggers violations, and how low-income drivers can cut the expense in half.

How Long Is the Interlock Required?

For a first-offense DUI, the interlock duration depends on whether you took or refused the chemical test:

• BAC test compliance (0.08% or higher): 6 months of interlock-restricted driving
• Chemical test refusal: 9 months of interlock-restricted driving

Both timelines begin after you complete a mandatory 30-day hard suspension during which you cannot drive at all. The interlock period runs concurrently with the remainder of your civil suspension.

The Camera Requirement

Vermont law requires that every approved IID include a camera that photographs the driver during each breath sample — both at startup and during rolling retests while driving. This prevents bypass attempts and creates a visual log that the DMV can review.

The camera activates automatically when the device prompts for a breath sample. You do not need to do anything beyond providing the sample normally. The photos are stored on the device and downloaded by the service vendor during monthly calibration appointments.

Installation and Monthly Costs

Calibration appointments are required every 30 days. During calibration, the vendor recalibrates the sensor, downloads stored data (including photos and any flagged events), and reports compliance status to the DMV.

Over a 6-month interlock period, the total IID cost runs roughly $550–$850. For a 9-month period (test refusal), expect $775–$1,150.

Low-Income IID Discounts

Under 23 V.S.A. § 1213(l)(1), Vermont law requires every approved IID manufacturer to reduce the cost of installation, monthly leasing, and deinstallation by at least 50% for drivers who present proof of enrollment in any of these public assistance programs:

• 3SquaresVT (Vermont's food assistance program)
• LIHEAP (Low Income Home Energy Assistance Program)
• Reach Up (Vermont's cash assistance program)

This is a statutory obligation on the manufacturer, not a discretionary discount — if you qualify, the vendor must honor the reduction. Bring documentation of your current enrollment to the installation appointment.

Additionally, under 23 V.S.A. § 1213(d), a driver who has installed an IID can ask the sentencing court to reduce the criminal DUI fine by up to 50% to help cover interlock costs. This requires submitting a financial affidavit demonstrating that income falls within public assistance guidelines.

Compliance Violations and Extensions

The IID monitors your BAC at every startup attempt and periodically during driving through rolling retests. Violations are taken seriously and extend the interlock requirement:

Failed startup (BAC 0.04% or higher): The device blocks the vehicle from starting and logs the event. Three failed startups within a monitoring period trigger a 3-month extension of the RDL requirement.

Failed rolling retest (BAC 0.04%–0.079%): A 3-month extension.

Failed rolling retest (BAC 0.08% or higher): A 6-month extension.

Missed calibration appointment: A 60-day extension. Do not skip or reschedule beyond the 30-day window.

Tampering, circumventing, or driving without interlock: A separate criminal offense plus an automatic 6-month extension.

These extensions are consecutive — they stack. A driver who misses a calibration and then records three failed startup attempts in the same period could see the interlock requirement grow by 5 months beyond the original end date.

Choosing an Approved Vendor

Vermont maintains a list of certified IID manufacturers authorized to install devices in the state. The DMV's IID Manufacturers page lists current approved vendors and their service center locations. When choosing a vendor, verify:

• They are currently certified by the Vermont DMV
• Their devices include the mandatory camera
• They have a service center within reasonable driving distance for monthly calibrations
• They participate in the 50% low-income discount program (all approved vendors are legally required to)

The installer files Form VL-082 (IID Installation Certification) directly with the DMV after installation. You do not need to submit this form yourself, but confirm with both the vendor and the DMV that it has been filed and logged.

Next Steps

The Vermont First-Offense DUI Guide includes a full IID compliance guide with a calibration calendar, violation avoidance strategies, and step-by-step instructions for coordinating installation timing so your restricted driving starts on Day 31 of the suspension.

See more Vermont guides →