Driving under the influence (DUI) is a serious offense that carries both criminal and civil penalties. One increasingly common tool used to combat DUI recidivism is the Ignition Interlock Device (IID). But what exactly is this device, how does it work, and who is legally required to install one?
In this article, we’ll break down everything you need to know about ignition interlock devices—from their mechanics and legal mandates to their role in reducing impaired driving. If you or someone you know has been charged with DUI in Colorado, understanding the implications of an IID is critical to navigating the legal process.
What Is an Ignition Interlock Device?
An ignition interlock device is a breathalyzer installed in a vehicle that prevents the engine from starting if the driver’s blood alcohol concentration (BAC) exceeds a preset limit—usually 0.02%, depending on the jurisdiction.
The device is roughly the size of a smartphone and is typically installed on or near the vehicle’s steering column. Before the vehicle can be started, the driver must blow into the mouthpiece. If alcohol is detected above the allowable limit, the car won’t start.
Key Components:
- Mouthpiece: Where the driver provides a breath sample.
- Handheld unit: Analyzes the sample and transmits results.
- Relay switch: Communicates with the vehicle’s ignition system.
How Does an Ignition Interlock Device Work?
The IID process is more comprehensive than simply testing BAC at startup. Here’s a closer look at how it functions:
1. Initial Test
Before starting the engine, the driver must blow into the device. If the BAC reading is within legal limits, the vehicle starts as normal.
2. Rolling Retests
To ensure that the person who initially blew into the device continues to drive sober, random rolling retests occur while the vehicle is in motion. The driver receives a prompt to provide another sample. If ignored or failed, the system logs the event, and in some cases, triggers the horn or lights to alert law enforcement.
3. Data Recording and Reporting
Modern devices store data like:
- BAC levels
- Test attempts and results
- Tampering events
- Missed retests
This information is regularly downloaded and shared with the appropriate legal or probationary authority.
4. Maintenance and Calibration
IID users are required to visit a certified provider every 30 to 60 days for calibration and inspection. Failure to comply can result in license suspension or extended IID requirements.
Express Consent
Colorado Law
In Colorado, ignition interlock devices are often mandatory for drivers convicted of DUI or driving while ability impaired (DWAI), depending on the severity of the offense and whether it is a repeat violation.
Common Scenarios Requiring IID Installation:
- First-Time DUI with BAC ≥ 0.15%
- Repeat DUI or DWAI offenders
- Drivers who refuse chemical testing (implied consent law violations)
- Early reinstatement of a suspended license
Duration of Use:
- First-time offense (BAC < 0.15%)
- First-time offense (BAC ≥ 0.15%): Minimum of 2 years
- Second or subsequent offenses: 2–4 years, depending on case details
➡️ For a detailed breakdown, visit the Colorado DMV Ignition Interlock Program.
Benefits of Ignition Interlock Devices
Though it may feel like a burden at first, the IID program serves several critical functions:
1. Enhancing Public Safety
By stopping intoxicated individuals from starting their vehicles, IIDs reduce the risk of alcohol-related accidents and fatalities.
2. Encouraging Behavioral Change
The requirement of regular sober driving instills new habits and discourages future offenses.
3. Legal Incentives
Many states, including Colorado, allow for early license reinstatement with IID participation, offering a path to partial freedom while maintaining oversight.
4. Data-Driven Oversight
Real-time monitoring helps courts and probation officers keep tabs on compliance, minimizing the risk of re-offense.
Costs and Installation
Installation Costs:
- Typically range from $70 to $150.
Monthly Maintenance:
- Around $60 to $90 per month.
The total cost over the course of a year may reach $1,000 or more, but financial assistance programs are available for qualifying low-income drivers in some states, including Colorado.
🔗 You can find local IID providers through the Colorado Approved Interlock Providers List.
Penalties for Noncompliance
Failing to comply with ignition interlock requirements can result in:
- Extended IID duration
- License revocation
- Fines and possible jail time
- Reset of your probation or reinstatement timeline
Tampering with or attempting to bypass an IID is considered a criminal offense in many jurisdictions.
Frequently Asked Questions
❓ Can someone else drive my car with an IID?
Yes—but they must also blow into the device and pass the test. If another driver fails, the primary driver is still held accountable.
❓ What happens if I fail a test due to mouthwash or medication?
Most IIDs are sensitive enough to distinguish between alcoholic beverages and trace elements, but residual alcohol from mouthwash or certain medicines may still cause false positives. It’s best to wait 15–20 minutes after using such products before testing.
❓ Can the IID shut off my engine while driving?
No. For safety reasons, the IID cannot shut off the engine once it’s running. However, failed rolling retests will be recorded and may lead to consequences later.
Legal Help for DUI and IID Issues
Understanding how ignition interlock devices work is just one piece of the puzzle when facing a DUI charge. An experienced Denver DUI attorney can help you navigate legal obligations, negotiate favorable terms, and advocate for early reinstatement options.
At Wolf Law, LLC, we’ve helped countless Coloradans restore their driving privileges and rebuild their lives after DUI charges. Whether you’re a first-time offender or facing repeat violations, our team is here to provide judgment-free guidance and aggressive representation.
👉 Contact Wolf Law today for a free consultation.
Take Control of Your Driving Future
Ignition interlock devices are more than just punitive tools—they’re part of a broader strategy to promote road safety and behavioral change. Understanding their function and legal implications can help DUI offenders regain control of their lives and avoid repeat offenses. If you’re unsure about your eligibility, requirements, or next legal steps, speak with a qualified criminal defense lawyer in Denver who can guide you through every stage of the process.
