Top 5 Myths About Ignition Interlock Devices—Debunked

What Is an Ignition Interlock Device?

An ignition interlock device (IID) is a small, handheld breathalyzer installed in a vehicle to prevent someone from starting the engine if their breath alcohol concentration (BrAC) is above a preset limit. Typically mandated by the court following a DUI or DWI conviction, these devices are designed to reduce repeat offenses and enhance road safety. Once installed, the driver must blow into the device before starting the car. If the sample is clean, the engine will start. Otherwise, it will remain immobilized. Additionally, many IIDs require rolling retests during a drive, where the driver must blow into the device at random intervals to ensure continued sobriety. Despite being a proven tool for reducing impaired driving, ignition interlock devices are surrounded by several myths and misconceptions. This article addresses the top five myths and sheds light on the facts, helping users and the general public better understand how these devices work and why they are important.

Myth #1: Ignition Interlock Devices Are Only for Repeat Offenders

A common belief is that only habitual DUI offenders are required to use ignition interlock devices. In reality, many states now mandate IIDs even for first-time offenders, depending on the severity of the offense or the individual’s blood alcohol concentration (BAC) at the time of arrest. For example, a first-time DUI offender with a BAC of 0.15% or higher may be required to install an IID as part of their sentencing. Some states also enforce all-offender IID laws, which require anyone convicted of DUI—regardless of prior offenses—to use the device for a specific period. This approach has been supported by numerous studies indicating that even first-time offenders are likely to reoffend, and early intervention can significantly reduce future DUI incidents. Therefore, the idea that ignition interlock devices are solely for repeat offenders is outdated and misleading.

Myth #2: You Can Trick the Device with Someone Else’s Breath

One of the more dangerous myths is that you can bypass an IID by having a sober person blow into it for you. While this might have been a potential loophole in earlier versions, modern ignition interlock devices are far more advanced and equipped with anti-circumvention features. Most IIDs are now installed with cameras that capture a photo each time a breath test is taken, ensuring that the person providing the breath sample is the one operating the vehicle. Additionally, devices log every test and report anomalies such as sudden changes in breath temperature or pressure, which can indicate tampering. Some systems even include facial recognition and GPS tracking to further prevent misuse. Attempting to fool the device not only results in violations but can also lead to extended IID requirements, additional fines, or further legal trouble. The reality is that these devices are built with robust security measures specifically to counter this kind of manipulation.

Myth #3: The Device Can Mistakenly Register Food or Mouthwash as Alcohol

Another prevalent myth is that using mouthwash or eating certain foods can trigger a false positive on an IID. While it is true that some alcohol-containing products like mouthwash or even ripe fruits may contain trace amounts of alcohol, modern interlock devices are designed to differentiate between residual mouth alcohol and actual impairment. To avoid potential false readings, users are advised to wait 15 to 20 minutes after eating, drinking (even non-alcoholic beverages), or using any oral hygiene products before taking the breath test. This waiting period allows any non-impairing substances to dissipate. Additionally, IIDs are calibrated to detect deep lung air, which provides a more accurate assessment of true blood alcohol content rather than just what’s lingering in the mouth. If a reading does result in a failure, the device typically prompts a retest within a few minutes, offering the user a chance to prove sobriety. These safety nets make it highly unlikely that everyday foods or products will lead to a wrongful lockout.

Myth #4: IIDs Are Too Expensive and Not Worth the Cost

There’s no denying that ignition interlock devices come with a price tag, but the myth that they are prohibitively expensive or not worth the investment is misleading. The cost of an IID can vary depending on the provider and the state, but most people can expect to pay between $70 and $150 for installation, followed by a monthly fee of $60 to $100 for monitoring and calibration. While these costs can add up, they are minor compared to the potential financial consequences of a repeat DUI, which can include hefty fines, increased insurance premiums, legal fees, job loss, and more. Furthermore, many states offer financial assistance or sliding scale fees for low-income individuals to ensure that cost doesn’t become a barrier to compliance. Considering that IIDs can restore limited driving privileges and help individuals get back to work or family responsibilities, the expense is a small price to pay for the benefits they provide. In the long run, an IID is a cost-effective solution for staying legal and safe on the road.

Myth #5: You Can Just Ignore the IID Requirement

Some people falsely believe they can avoid using an ignition interlock device by simply not driving or by finding workarounds like driving someone else’s car. In reality, attempting to sidestep an IID order can lead to serious legal consequences, including license suspension, jail time, and additional penalties. Most courts and DMV offices require proof of IID installation before reinstating driving privileges. In many jurisdictions, failure to comply with an IID order can reset the suspension period or even lead to felony charges, especially if caught driving without one. Moreover, modern enforcement technologies, such as license plate readers and electronic monitoring, make it increasingly difficult to cheat the system. It’s also worth noting that insurance companies may require proof of IID installation as a condition of maintaining coverage. Skirting around the requirement isn’t just illegal—it’s ultimately more costly and risky than simply complying with the mandate.

How Long Must You Use an Ignition Interlock Device?

The length of time a person must use an ignition interlock device depends on several factors: the severity of the offense, state laws, and whether it was a first-time or repeat conviction. In many cases, first-time offenders may be required to use an IID for 6 months to a year, while repeat offenders can face mandates of 1 to 3 years or more. Some states also employ a compliance-based removal system, meaning that the user must demonstrate a period of clean, violation-free usage before the device can be removed. This policy reinforces accountability and encourages responsible behavior. Additionally, any violations such as failed tests, missed retests, or tampering attempts can extend the required period. It’s critical for users to understand the conditions of their program and strictly follow all guidelines to avoid unnecessary extensions or penalties.

The Technology Behind Ignition Interlock Devices

Today’s ignition interlock devices are more sophisticated than ever. At their core, these devices use fuel cell sensor technology to measure the alcohol content in a person’s breath accurately. Fuel cell sensors are known for their high specificity and resistance to interference, making them ideal for legal and law enforcement applications. In addition to alcohol detection, most devices now include features like GPS tracking, camera verification, rolling retests, and real-time reporting. Data collected from the device is typically transmitted to a monitoring agency, probation officer, or the court, allowing for timely review and intervention if needed. These advancements have made IIDs more reliable, tamper-proof, and effective in ensuring public safety. As a result, they play an increasingly important role in DUI prevention strategies across the country.

Legal and Administrative Requirements for IIDs

Each state has its own laws and administrative procedures governing the use of ignition interlock devices. Generally, a court or DMV will order the installation of an IID as a condition for reinstating driving privileges following a DUI conviction. Users must have the device installed by an approved provider and regularly attend calibration appointments. They are also required to maintain a log of clean usage and may be subject to periodic reviews. Failure to comply can result in license re-suspension, additional court appearances, or extended usage periods. Some states offer early removal programs for those who meet all requirements ahead of schedule. Understanding the local laws and ensuring full compliance is crucial for completing the program successfully and regaining full driving rights.

The Real Impact of IIDs on Road Safety

Numerous studies have shown that ignition interlock devices are highly effective at reducing repeat DUI offenses. According to the CDC, IIDs reduce repeat offenses by about 70% while the device is installed. Furthermore, states with mandatory IID laws for all offenders have seen significant reductions in alcohol-related crash deaths. The devices not only protect the public but also serve as a rehabilitative tool for offenders, helping them establish safer driving habits. By requiring sobriety before driving, IIDs create a consistent reminder of the consequences of impaired driving and foster long-term behavioral change. In this way, they are more than just a punishment—they’re a proactive step toward safer communities.

Conclusion: Busting the Myths for Good

Ignition interlock devices are often misunderstood, leading to unnecessary fear, resistance, and misinformation. By debunking these common myths, we gain a clearer understanding of how IIDs actually work and why they matter. They are not just punitive tools, but effective, evidence-based instruments that save lives and support recovery. Whether you’re facing a court order, supporting someone through the process, or simply curious, it’s important to separate fact from fiction. Knowledge is the first step toward compliance and, ultimately, safer roads for everyone.

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