How Long Do You Need an Ignition Interlock?
Utah Requires 18 or 36 Months of Ignition Interlock Depending on Offense Circumstances
The ignition interlock requirement in Utah lasts 18 months for a standard first-offense DUI and 36 months for aggravated circumstances including high BAC (0.16 or above), second or subsequent offenses, test refusals, and DUI with a minor passenger. These are mandatory minimum periods set by statute. The court cannot reduce them below the statutory minimum, but violations can extend them beyond it.
The interlock period begins on the date the device is installed, not the date of conviction, sentencing, or license suspension. Installing the IID promptly after sentencing starts the clock sooner, which means the requirement is satisfied sooner. Delays in installation delay completion. Glen Neeley has advised clients on interlock timing strategy since 1998.
IID Duration by Offense Type
18-Month Requirement
Applies to standard first-offense DUI with a BAC below 0.16, no minor passengers, no refusal to submit to chemical testing, and no prior DUI convictions within 10 years. The 18-month period is the minimum for any DUI conviction requiring an interlock in Utah.
36-Month Requirement
Applies to first-offense DUI with BAC of 0.16 or higher, second DUI within 10 years, third or subsequent DUI, refusal to submit to chemical testing, and DUI with a passenger under 16 years old. The 36-month period doubles the duration and cost of the interlock requirement.
What Can Extend the IID Period Beyond the Minimum
The statutory periods of 18 and 36 months are minimums. Several factors can extend the requirement beyond these periods.
Interlock violations, including failed breath tests, missed rolling retests, missed monitoring appointments, and evidence of tampering, can each trigger extensions. The Driver License Division reviews the interlock data and can add months to the requirement for each violation.
Failure to install the device when required can also extend the overall timeline. If the court orders IID installation and the defendant delays, the interlock clock does not start until installation occurs. The suspension continues, and additional consequences may follow.
Probation violations related to the interlock can result in court orders extending the IID requirement as part of revised probation conditions.
The best strategy for completing the interlock requirement on time is prompt installation, strict compliance with all requirements, attendance at every monitoring appointment, and complete avoidance of alcohol. Monthly costs of $70 to $150 multiply with each month of extension.
When the IID Period Ends
The interlock period ends when the mandatory minimum has been served without violations and the Driver License Division authorizes removal. The defendant contacts their interlock provider to schedule a removal appointment. The removal fee is typically $50 to $100.
After removal, the defendant must continue to comply with any remaining probation conditions and maintain SR-22 insurance for the required period. Completion of the interlock requirement does not automatically end other DUI-related obligations.
The interlock removal marks an important milestone in the DUI sentence. For expungement purposes, the sentence is not complete until the interlock requirement and all other sentence components are satisfied. The interlock removal date may be the date that starts the expungement waiting period if it is the last component completed.
Frequently Asked Questions About IID Duration
Can a judge order less than 18 months of interlock?
No. The 18-month minimum for a standard first offense is set by Utah statute. Judges cannot reduce the IID requirement below the statutory minimum.
Does the IID period start from my conviction date?
No. The period starts from the date the device is installed on your vehicle. Prompt installation starts the clock sooner.
What if I do not drive during the IID period?
Not driving does not satisfy the IID requirement. The device must be installed and actively monitored for the full period regardless of how frequently you drive. If you do not own a vehicle, you still must comply with the IID requirement on any vehicle you operate.
Financial Impact of IID Duration
At $70-$150/month, 18 months costs $1,260-$2,700 in monitoring. Total costs with installation and removal reach $1,410-$3,000 for 18 months or $2,670-$5,700 for 36 months.
IID Duration and Expungement Timing
The interlock is a sentence component. Expungement waiting period does not begin until completion. Extensions delay everything. Early compliance is particularly important.
Financial Impact of IID Duration
At $70-$150/month, 18 months costs $1,260-$2,700 in monitoring. Total costs with installation and removal reach $1,410-$3,000 for 18 months or $2,670-$5,700 for 36 months.
IID Duration and Expungement Timing
The interlock is a sentence component. Expungement waiting period does not begin until completion. Extensions delay everything. Early compliance is particularly important.
Financial Impact of IID Duration
At $70-$150/month, 18 months costs $1,260-$2,700 in monitoring. Total costs with installation and removal reach $1,410-$3,000 for 18 months or $2,670-$5,700 for 36 months.
IID Duration and Expungement Timing
The interlock is a sentence component. Expungement waiting period does not begin until completion. Extensions delay everything. Early compliance is particularly important.
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.
How Device Data Downloads Affect Your Case
Every ignition interlock device maintains a continuous data log. The log captures timestamps for each breath test, the BAC reading for each sample, vehicle start and stop times, any skipped or missed rolling retests, and power disconnection events. This data is downloaded during each calibration appointment and transmitted to monitoring authorities.
Data patterns matter. A single marginally elevated reading may be explainable, but a pattern of borderline readings, missed retests, or power interruptions creates a record that the Driver License Division or court may interpret as noncompliance. As a board-certified DUI defense attorney and NCDD faculty member, Glen Neeley understands how to read and challenge interlock data when the results do not accurately reflect a client’s behavior.
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.
Common Interlock Myths Versus Reality
Several misconceptions surround ignition interlock devices. One common myth is that mouthwash or certain foods will cause a failed test. While some products containing alcohol can produce a brief elevated reading, the device is calibrated to detect ethanol at specific concentrations. Rinsing your mouth with water and waiting a few minutes before testing typically resolves residual mouth alcohol from food or hygiene products.
Another myth is that someone else can blow into the device for you. Modern IID units use camera verification and breath pattern recognition to prevent circumvention attempts. Attempting to have another person provide a breath sample is a violation that carries serious consequences, including extended interlock periods and potential criminal charges. The device is designed to ensure that the person providing the sample is the driver.
Some drivers believe that disconnecting the battery will reset the device or erase violation data. This is incorrect. Power disconnections are logged and reported. Tampering with the device or its power source creates additional violations that can extend your restricted driving period and result in further penalties from the Utah Driver License Division.
Talk to Glen Neeley About Your Case
Free confidential consultation. Available 24/7. Statewide Utah.
801-645-5008