Wolf Law is proud to serve Denver and surrounding communities, including Aurora, Lakewood, and the broader Denver Metro area. If you have been convicted of DUI or DWAI in Colorado, or if you are trying to reinstate your license after a revocation, you will almost certainly encounter Colorado’s ignition interlock device requirements. An ignition interlock device is a breath-testing unit installed in your vehicle that requires a clean breath sample before the engine will start. Understanding the rules, the requirements, and your rights under Colorado’s interlock program is essential for anyone managing the aftermath of a DUI case.
Wolf Law represents individuals across Colorado with a criminal defense practice focused on preparation, strategy, and strong legal advocacy. Attorneys and Partners Jeff Wolf and Colleen Kelley lead the firm’s defense team, each bringing decades of trial experience, sharp legal analysis, and a commitment to protecting their clients’ rights at every stage. Both attorneys are known for their national media presence, including commentary on Court TV and Law & Crime, and both bring that same level of analytical rigor and client-focused preparation to every aspect of DUI defense and post-conviction compliance they handle in Colorado. Together, they reflect Wolf Law’s philosophy that excellent criminal defense means standing beside clients through every stage of the process.
Colorado’s ignition interlock requirements were significantly expanded in recent years and now apply to a broader range of DUI situations than before. Knowing exactly when the interlock is required, how long it must remain installed, and what happens if you violate interlock conditions is critical information for any DUI defendant in Colorado.
What Is an Ignition Interlock Device and How Does It Work?
An ignition interlock device is a handheld breath-testing unit wired into a vehicle’s ignition system. Before the vehicle will start, the driver must provide a breath sample that registers below a set threshold — typically 0.025 BAC in Colorado. The device also requires periodic rolling retests while the vehicle is in operation to ensure the driver remains compliant throughout the trip.
Results from every test — including failures, refusals, and circumvention attempts — are logged by the device and reported to the Colorado Division of Motor Vehicles. The interlock service provider downloads this data at regular calibration appointments, which are required monthly in Colorado. Any violation recorded by the device can extend the required interlock period or result in further license sanctions.
When Is an Ignition Interlock Device Required in Colorado?
Colorado’s interlock requirements apply in two overlapping contexts: as a condition of obtaining a restricted license during a revocation period, and as a condition of full license reinstatement after that period ends.
- First DUI conviction: For a first DUI conviction with no aggravating factors, Colorado requires an interlock device for at least eight months following reinstatement of driving privileges. Drivers may be eligible for a restricted license with interlock during a portion of the revocation period as well.
- First DUI with BAC of 0.15 or higher: A higher BAC on a first offense typically triggers a longer required interlock period. Colorado’s interlock rules scale with the severity of the offense.
- Second DUI conviction: A second DUI conviction in Colorado requires two years of ignition interlock following license reinstatement.
- Third DUI conviction: A third conviction requires two years of interlock following reinstatement, and the overall revocation and reinstatement timeline is significantly longer.
- Refusal to submit to chemical testing: Refusing a breath or blood test under Colorado’s express consent law triggers its own revocation period and interlock requirements separate from the criminal conviction.
What Are the Rules for Using an Ignition Interlock Device in Colorado?
Compliance with Colorado’s interlock requirements involves more than simply having the device installed. There are ongoing obligations that must be met throughout the required period:
- Monthly calibration appointments: Drivers must bring their vehicle to an approved interlock service provider every month for calibration, data download, and device inspection. Missing an appointment is a violation.
- No circumvention attempts: Attempting to start the vehicle without providing a breath sample, having someone else provide the sample, or tampering with the device in any way are violations that are logged and reported. Circumvention can result in criminal charges under Colorado law in addition to extended interlock requirements.
- Rolling retest compliance: When a rolling retest is requested while driving, the driver must provide a sample within the required timeframe. Ignoring a rolling retest or failing one while driving is a logged violation.
- No driving a vehicle without an interlock: During the required interlock period, driving any vehicle that does not have an approved interlock device installed is a violation of the restricted license conditions and can result in additional charges.
Facing DUI charges or interlock compliance issues in Denver, Aurora, or Lakewood? Call Wolf Law at 720.479.8574 for a free consultation. Our attorneys will help you understand your obligations and your options.
What Happens If You Violate Ignition Interlock Requirements in Colorado?
Violations of Colorado’s ignition interlock program are taken seriously by the DMV and by the courts. The consequences depend on the nature and frequency of the violation:
- Failed breath sample: A single failed test does not automatically result in an extended interlock period, but patterns of failures are reported to the DMV and can trigger a hearing and extended requirements.
- Missed calibration: Failing to appear for a required monthly calibration appointment is reported as a violation. Repeated missed appointments can result in a license suspension and reset of the interlock period.
- Circumvention: Any attempt to defeat or bypass the interlock device is a serious violation. Colorado law makes it a criminal offense to tamper with an interlock device, and these violations are reported directly to the DMV and can result in an extended interlock period of up to two additional years.
- Driving without an interlock: Driving a vehicle without an approved interlock during the required period is a traffic offense that can result in criminal charges and additional license sanctions.
How to Know When the Interlock Period Ends in Colorado
The interlock period in Colorado does not end automatically. Before a driver can have the device removed, they must complete the full required period without disqualifying violations, apply to the Colorado DMV for removal, and receive written authorization. Removing the device before receiving authorization results in license revocation.
Our attorneys assist clients in understanding exactly when their interlock period is set to end, what compliance record is required for removal, and how to complete the process correctly. A missed step or premature removal is an avoidable problem that can extend the entire process significantly.
Why the Right Legal Representation Matters for Interlock and DUI Consequences
The ignition interlock requirements that follow a DUI conviction are directly linked to the outcome of the criminal case. A reduction from DUI to DWAI, a successful challenge to the BAC evidence, or a favorable plea resolution can all affect the length and conditions of the required interlock period. The decisions made in the criminal case have lasting practical consequences for how long the interlock stays in your vehicle.
Jeff Wolf and Colleen Kelley are both excellent trial attorneys who understand the full scope of consequences that flow from a DUI conviction in Colorado. Both have appeared on national platforms including Law & Crime and Court TV, and both bring the same thorough, client-focused preparation to DUI defense cases in Denver County Court, the Jefferson County Courthouse in Lakewood, and courts throughout the Denver Metro area.
Step-by-Step: Colorado’s DUI Interlock Process After Conviction
- Revocation begins: Following a DUI conviction or chemical test refusal, the Colorado DMV revokes driving privileges. The length of the revocation depends on the offense and prior record.
- Apply for restricted license with interlock: After the mandatory hard suspension period, a driver may apply for a restricted license that permits driving only vehicles equipped with an approved interlock device.
- Install approved device: The driver arranges installation through a Colorado-approved interlock provider. The vehicle must pass an installation inspection before the restricted license becomes valid.
- Complete required period with full compliance: The driver must complete the required interlock period, attend monthly calibration appointments, and avoid all violations.
- Apply for full reinstatement: After completing the required period, the driver applies to the DMV for removal authorization and full license reinstatement.
Frequently Asked Questions About Colorado Ignition Interlock Devices
How long do I need an ignition interlock device after a DUI in Colorado?
The required period depends on the circumstances of the DUI, your driving history, and the type of license reinstatement. Some drivers may qualify for early reinstatement with an interlock device.
Can I drive without an ignition interlock device if one is required?
No. Driving a vehicle without the required interlock device can lead to additional license consequences and may extend the interlock requirement.
What happens if I fail an ignition interlock test?
Failed tests, missed tests, or other violations may be reported by the interlock provider and can affect your driving privileges or the length of your interlock requirement.
Can I get my Colorado driver’s license back early with an ignition interlock device?
In some cases, yes. Colorado allows certain drivers to seek early license reinstatement by meeting eligibility requirements and installing an approved ignition interlock device.
Contact Wolf Law About Your DUI Case and What Comes After
The interlock device is one part of a larger picture of DUI consequences in Colorado. The decisions made in your criminal case affect every part of that picture. Wolf Law offers free consultations, and our attorneys will help you understand what you are facing, fight for the best possible outcome in your case, and guide you through what comes after. Call 720.479.8574 today.
Wolf Law represents clients throughout Colorado with excellent criminal defense. From Denver and Aurora to Lakewood and the communities along the I-25 corridor, our legal team handles DUI cases and their consequences from start to finish. Call Wolf Law at 720.479.8574 for your free consultation.
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