Have you found yourself or a loved one sitting in a courtroom with a DUI conviction? Not only is there a license suspension, but you also hear something about an “ignition interlock device.” Now you’re asking yourself, “What is an ignition interlock device?“

An ignition interlock device might seem like a punishment, but for many people, it becomes the bridge back to normalcy – a way to drive legally while demonstrating your commitment to safe, sober driving.

Let’s walk through everything you need to know about these devices, from how they work to what daily life with an ignition interlock device will look like. By the end of this guide, you’ll have the knowledge you need to move forward with confidence.

What Is an Interlock Device and Why Does It Matter?

An ignition interlock device (IID) is essentially a mini breathalyzer that’s wired directly into your car’s ignition system. The device itself is about the size of a cell phone, making it compact and easy to fit in your vehicle.

Think of it as a sober driving checkpoint that happens every time you want to start your vehicle.

Ignition interlock devices are typically installed in a motor vehicle as required by law for certain DUI offenses. The device requires you to provide a breath sample before your engine will turn over, and it analyzes that sample for alcohol content.

If your blood alcohol concentration (BAC) is below the programmed limit – typically around 0.025, which is well below the legal driving limit of 0.08 – your car starts normally. If alcohol is detected above that threshold, the engine simply won’t start. It’s that straightforward.

The Simple Truth About What Is an Interlock Device

At its core, an interlock device is about second chances with accountability built in. The device is installed in the individual’s vehicle to ensure compliance with court or DMV requirement and it uses the same reliable technology found in professional-grade breathalyzers used by law enforcement.

Let’s talk about how an IID works.

How Does an Ignition Interlock Device Work?

Understanding how an ignition interlock device operates can help reduce anxiety about using one. The process is actually quite intuitive once you get used to it. Here’s exactly what happens each time you want to drive:

• You get in your car and turn the key to the “on” position (but the engine won’t start yet)
• The device prompts you with lights or sounds to provide a breath sample, and the driver blows steadily into the mouthpiece for about 5-6 seconds until you hear a tone
• The device analyzes your breath and displays the result within 10-15 seconds
• If you pass (BAC below the preset limit), the device sends a signal allowing the engine to start
• If you fail, the engine remains disabled and the violation is logged for reporting

But the testing doesn’t stop once you’re driving. The device will require random retests to ensure ongoing sobriety. The device will prompt you for additional breath samples at random intervals while you’re on the road – these are called “rolling retests.”

Don’t worry though; the device gives you several minutes to safely pull over and provide the sample. If you miss a rolling retest or fail one, your car won’t suddenly shut off (that would be dangerous), but it will trigger alarms like honking horns and flashing lights or flash lights until you turn off the engine. Any failure is logged by the device and may result in further consequences.

What is an Ignition Interlock Device Program?

The ignition interlock device program is a cornerstone in the fight against drunk driving, designed to keep roads safer while giving individuals a structured path back to responsible driving.

When a driver is convicted of a drunk driving offense, participation in an ignition interlock device program is often required. This means an IID is installed in the individual’s vehicle, and the driver must provide a breath sample before the engine will start.

For many, this program is a mandatory step after being convicted of drunk driving, but it also serves as a valuable opportunity to demonstrate compliance and regain driving privileges. By participating fully and following all requirements, drivers can work toward restoring their independence and rebuilding trust on the road.

When Are the Typical IID Requirements in 2025?

The landscape of interlock device requirements has evolved significantly, and 2025 brings some important updates you should know about. Currently, all 50 states have some form of ignition interlock program, though the specific requirements vary by location.

Generally, you’ll be required to install an ignition interlock device if you’re convicted of driving under the influence, especially if your BAC was 0.08 or higher, if you refused a breathalyzer test, or if you’re a repeat offender.

Many states now require interlock devices even for first-time offenders, recognizing their effectiveness in preventing repeat violations. Ignition interlocks are mandated for certain offenses, and a second offense often results in a longer period of required device use.

The duration of required interlock use typically ranges from 6 months to several years, depending on your state’s laws and the specifics of your case.

Vehicle Requirements for Interlock Devices

Not every vehicle is immediately ready for an ignition interlock device. In fact, there are specific requirements to ensure the device works as intended.

For starters, to have an ignition interlock device installed, the vehicle must be equipped with a compatible ignition system that allows the device to be properly connected. Installation must be performed by an approved IID installer, who will ensure the interlock device is securely fitted and fully operational. Regular calibration and inspection are essential to maintain the device’s accuracy and reliability, and these appointments are typically scheduled every 30 to 60 days.

Exemptions and Exceptions: Who Might Not Need an Interlock Device?

While ignition interlock devices are a standard requirement for most individuals convicted of drunk driving offenses, there are a few circumstances where exemptions or exceptions may apply.

For example, if a person does not own a vehicle or does not have regular access to a vehicle, the court may determine that installing an ignition interlock device is not feasible. Similarly, individuals with certain medical conditions that make it impossible to provide a breath sample, such as severe respiratory illnesses, may be considered for an exemption from the ignition interlock device program.

It’s important to understand that these exemptions are rare and are evaluated on a case-by-case basis. Documentation and approval from the court or relevant authorities are usually required, and the individual must demonstrate that their circumstances genuinely prevent compliance with the ignition interlock device requirement.

Costs & Maintenance of IIDs in 2025

Now, let’s talk about the financial reality of ignition interlock devices. The expenses associated with these devices fall into several categories:

• Installation fee: typically $70-$150 depending on your vehicle and location
• Monthly monitoring fee: usually $60-$90 per month for device rental and data reporting
• Calibration/maintenance visits: $25-$50 every 30-60 days as required by your state
• Removal fee: generally $50-$100 when your requirement period ends
• Lockout service calls: $50-$100 if you need emergency assistance with device issues

Over a typical 6-month requirement period, you’re looking at total costs between $500-$1,200. While this isn’t insignificant, many people find it manageable compared to the alternative of losing driving privileges entirely.

The good news is that many interlock companies offer payment plans, and some states have assistance programs for low-income individuals.

Additionally, many auto insurance companies now offer discounts for drivers who voluntarily maintain interlock devices beyond their required period, recognizing them as a proactive safety measure.

Noncompliance and Penalties: What Happens If You Break the Rules?

Staying compliant with the ignition interlock device program is essential if you want to maintain your driving privileges and avoid further legal trouble. Noncompliance can take several forms, such as:

• Failing to have the ignition interlock device installed
• Missing required breath samples
• Tampering with the device
• Attempting to circumvent its operation

Penalties for noncompliance may include fines, an extension of the ignition interlock device program, additional monitoring requirements, or even the revocation of driving privileges. In some cases, repeated violations can lead to imprisonment or other legal actions.

Removal and Reinstatement: Life After the Interlock Device

Completing the ignition interlock device program is a significant milestone, and it opens the door to regaining your full driving privileges. Once you’ve fulfilled the specified period required by the court or DMV, and you’ve met all program requirements, you may be eligible to have the ignition interlock device removed from your vehicle.

The removal process typically involves scheduling an appointment with your IID installer, who will verify your compliance and safely uninstall the device. After removal, you’ll need to apply for reinstatement of your driver license, which may include paying a reinstatement fee and providing proof that you’ve met all obligations of the ignition interlock device program.

Pros & Cons of Using an Interlock Device

When weighing whether an ignition interlock device is right for your situation, it’s important to consider both the benefits and challenges you’ll face. Here are the key advantages most people experience:

• Maintain driving privileges for work, family, and essential needs
• Demonstrate responsibility and commitment to sobriety to courts and employers
• Avoid the complete social and economic isolation that comes with license suspension
• Provide peace of mind for family members concerned about your safety
• Potentially reduce insurance costs through participation in safety programs

However, there are also challenges to consider honestly. The daily routine of breath testing can feel intrusive at first, and you’ll need to plan extra time for the testing process. Some people find the rolling retests stressful, especially in traffic or social situations. There’s also the financial burden we discussed, plus the need to explain the device to passengers or valets.

The device can also be sensitive to certain foods, mouthwash, or medical conditions that might cause false positives, requiring you to be mindful of what you consume before driving. Additionally, cold weather can affect device performance, and you’ll need to keep spare mouthpieces and batteries on hand.

Move Forward with Confidence with Low Cost Interlock

Facing the requirement for an ignition interlock device can feel overwhelming, but remember that thousands of people successfully navigate this process every year. The device isn’t just a legal requirement – it’s a tool that can help you rebuild trust with your family, maintain your livelihood, and prove to yourself that you’re committed to making better choices.

If you or a loved one are in need of an affordable, budget-friendly ignition interlock device, look no further than Low Cost Interlock.

Give our team a call to learn more about our low cost ignition interlock solutions today