Driving to Work with an Interlock Device

The IID Allows You to Drive for Work, but Compliance Requirements Apply to Every Trip

One of the primary purposes of Utah's ignition interlock requirement is to allow DUI defendants to continue driving for work and other essential purposes while maintaining a safeguard against impaired driving. The IID does not restrict where you can drive or when. It restricts only whether you can drive by requiring a clean breath sample before starting the vehicle and during random rolling retests. This means you can drive to work, drive during work, and drive home from work, provided the device confirms you are not impaired.

For many DUI defendants, maintaining the ability to drive to work is the most important practical consideration during the interlock period. Understanding how the device works in daily driving, how to avoid false failures, and how the employer work vehicle exception operates helps you manage the requirement without disrupting your employment. Glen Neeley has advised clients on work-related interlock issues since 1998.

How the IID Works for Daily Commuting

Each time you start your vehicle, the IID requires a breath sample. If the sample is clean (below 0.02 BAC), the vehicle starts normally. The entire process takes about 10 to 15 seconds. For a morning commute, this means starting the breath test a few seconds before you would normally turn the key.

During your commute, the device will request rolling retests at random intervals. When the device beeps, you have a few minutes to provide a sample. You can pull over or provide the sample while driving, depending on your comfort level and safety considerations. Missing the retest window is recorded as a violation.

The device does not affect vehicle performance. Once started, the engine runs normally. The only difference from a non-equipped vehicle is the startup test and periodic rolling retests. Most employers and coworkers will not notice the device during normal driving.

Monthly costs of $70 to $150 for the IID should be factored into your transportation budget. Installation costs of $100 to $200 are a one-time expense.

The Employer Vehicle Exception

Utah law provides a limited exception for employer-owned vehicles. An employer can authorize the defendant to drive a company vehicle without an IID installed, but only for employment purposes. The employer must provide written authorization, and the exception applies only to vehicles owned by the employer, not to vehicles the defendant owns or leases for work.

This exception is valuable for defendants who drive company trucks, delivery vehicles, or other work vehicles that cannot practically have an IID installed. The written authorization should be kept in the vehicle at all times as proof of the exception.

Not all employers are willing to provide this authorization. Some company policies prohibit employees with DUI convictions from driving company vehicles, regardless of the legal exception. Discuss the option with your employer before assuming it is available.

The exception does not extend to personal driving. Even if you drive a company vehicle without an IID during work hours, your personal vehicle must still have the IID installed and you must use it for all non-work driving.

Avoiding False Failures Before and During Work

The most common cause of unexpected failed interlock tests is residual alcohol from products other than consumed alcoholic beverages. Before driving to work, avoid alcohol-containing mouthwash (use alcohol-free brands), hand sanitizer applied immediately before testing, cough syrup or cold medications containing alcohol, and food or beverages that may produce trace alcohol readings.

If you fail a startup test in the morning, do not panic. Wait 15 to 20 minutes and retest. Residual mouth alcohol from food, hygiene products, or medications typically dissipates within this period. A clean retest after the waiting period is consistent with non-consumed alcohol and reduces the significance of the initial failure in DLD review.

Keep a log of any failed tests and the circumstances surrounding them. If you used mouthwash or took medication before a failed test, note the product and timing. This documentation can help explain the failure if it is questioned during a monitoring review.

Frequently Asked Questions About Driving to Work with an IID

Employer Notification and Workplace Considerations

Utah law does not require you to notify your employer about an ignition interlock requirement in most situations. However, if your job requires driving a company vehicle, the interlock restriction on your license will affect your ability to operate vehicles that do not have an installed device. Our office helps clients understand how the restriction interacts with commercial driving privileges and employer fleet policies.

If you drive a personal vehicle to a job site or between work locations, the interlock device will be part of your daily commute. Calibration appointments, which are typically required every 30 to 60 days, may need to be scheduled around work hours. Glen Neeley has helped clients coordinate IID compliance schedules with employment obligations since 1998, and we understand the practical impact these requirements have on working professionals in Utah.

Daily Life with an Ignition Interlock Device in Utah

Living with an ignition interlock device (IID) changes your morning routine. Before starting the vehicle, you provide a breath sample into the handset. The device takes a few seconds to analyze the sample. If it reads below the preset threshold, the vehicle starts normally. If the reading is above the limit, the device locks the ignition for a timed waiting period before you can retest.

Cold weather in Utah creates additional considerations. During winter months, the device may take longer to warm up and provide accurate readings. We advise our clients to allow extra time before scheduled departures, particularly during December through February when temperatures in the Salt Lake Valley and surrounding areas regularly drop below freezing. The handset should be stored in a location where it will not freeze overnight.

Passengers in your vehicle may ask about the device. There is no legal prohibition against having passengers while driving with an IID, and you are not required to explain the device to anyone. However, the device will prompt rolling retests during your drive, which means you will need to provide additional breath samples while the vehicle is in motion. These retests are timed, and missing one can trigger a violation.

Insurance Implications of an Interlock Requirement

An ignition interlock requirement in Utah is connected to your driving record and typically accompanies an SR-22 insurance filing requirement. The SR-22 is a certificate of financial responsibility that your insurance company files with the Utah Driver License Division. Carrying both an IID and SR-22 increases your insurance premiums, sometimes substantially depending on your prior driving history and the insurance carrier.

The duration of elevated insurance costs often extends beyond the interlock period itself. Many carriers reassess rates based on the full timeline of the DUI-related events on your record. We review these financial impacts with clients during consultation because the total cost of a DUI conviction in Utah extends well beyond fines and court fees. Understanding these costs early helps you plan and budget appropriately.

What Happens at a Calibration Appointment

Calibration appointments are required at regular intervals, typically every 30 to 60 days depending on the service provider and court order. During calibration, the service technician downloads the data log from your device, recalibrates the sensor accuracy, and inspects the unit for tampering or damage. The appointment usually takes 30 to 60 minutes.

The data download is one of the most important parts of the calibration visit. The device records every breath sample, every failed test, every missed rolling retest, and any attempts to tamper with the unit. This data is reported to the Utah Driver License Division and, in some cases, to your probation officer or the court. If the data shows violations, consequences can follow quickly. Our office reviews data reports with clients to identify potential issues before they escalate.