Common Questions About Ignition Interlock Devices (IID)

What is an ignition interlock device (IID)?

An ignition interlock device (IID) is a car breathalyzer system installed in your vehicle to prevent a car from starting if alcohol is detected on the driver’s breath and may be required following a DUI violation. The IID device includes a mouthpiece for breath sampling, a handheld unit that measures breath alcohol content (BrAC), and a cord connecting the system to your vehicle’s ignition.

Want to know more about how an IID works? Watch our video

Can I voluntarily install an IID?

Yes, you can to help ensure safe driving and prevent potential DUI incidents. Often, those who struggle with sobriety or their family members will opt to install a voluntary interlock device to prevent a DUI or repeat DUI. Intoxalock offers special pricing for voluntary IID installations.

Call us today at 877-272-5195 to learn more about voluntary interlock device options and take a proactive step in preventing DUIs.

When do I need an interlock ignition device?

In most states, an IID is required for drivers arrested for or convicted of a DUI or DWI before they can legally drive again. The specific timing for IID installation varies by state, so it’s important to review your state regulations.

Need help understanding your state’s IID requirements? Speak to one of our State Specialists at 877-272-5195 or fill out a form below.

Are ignition interlock devices effective in preventing drunk driving?

Ignition interlock devices are extremely effective in preventing repeat drunk driving offenses. They are endorsed by organizations like Mothers Against Drunk Driving (MADD) and the National Highway Traffic Safety Administration (NHTSA). Strict ignition interlock laws have saved countless numbers of lives across the country.

Explore more about the impact of IID programs on road safety.

How does an ignition interlock device work?

The IID measures your Breath Alcohol Content (BrAC) to ensure it’s below the legal limit set by your state. To start your vehicle, you’ll need to blow, inhale, and blow again into the device’s mouthpiece as explained by your an installer technician. Once the vehicle is in motion, the device will ask for random retests to ensure the continued absence of alcohol.

Want to learn more about how the blow pattern works? Find out here.

Will an IID cause damage to my car?

No, Intoxalock IIDs are installed by trained professionals using methods that should not cause damage to your vehicle. The installation process is designed to be safe and reversible, ensuring your car remains in good condition. It is critical to choose an interlock provider with highly trained technicians. At Intoxalock, each installer is trained and certified, and their work is held to high standards to protect your vehicle.

How long will my IID installation take?

The installation of an ignition interlock device typically takes about one to four hours, depending on your vehicle type and the complexity of the installation. Intoxalock service centers work efficiently to get you back on the road as quickly as possible. Let your Intoxalock representative know if you drive an electric-powered vehicle or hybrid to get a more accurate time and cost estimate.

What happens if I fail the breath test when I am trying to start my car?

If you fail the breath test, your car won’t start. You may continue to submit samples as prompted. Multiple failed attempts can result in a temporary lockout, requiring you to wait before trying again, or a service lockout that will necessitate a visit to a service center.

Learn more about failed breath tests.

Can I start my vehicle without blowing in the car breathalyzer?

No, you must provide a clean breath sample to start your vehicle. Ignition interlock devices are designed to prevent a vehicle from starting if alcohol is detected in your system. The device measures your Breath Alcohol Content (BrAC) to ensure you're below the legal limit. Retests may also be required while driving, with the BrAC limits and retest guidelines varying based on your state's regulations.

What is a lockout?

A lockout is a state-mandated function that prevents your vehicle from starting. Lockouts can occur if you blow a BrAC (Breath Alcohol Concentration) above the state’s legal limit, submit too many high BrAC samples, fail to provide a breath sample, or attempt to tamper with the ignition interlock device.

What is a calibration?

A calibration is a routine maintenance appointment where your ignition interlock device is checked to ensure it’s measuring alcohol levels accurately.

What information is reported to the state or my monitoring authority?

Reports include the time and BrAC level of each breath sample, missed tests, tampering evidence, and photo verification of driver identity. Additional items like missed calibrations and periods of non-usage may also be reported, depending on state and monitoring authority requirements.

How do I remove my IID?

Do not attempt to remove your IID yourself. Any Intoxalock-certified service center can remove your ignition interlock device.

Schedule your removal appointment by calling Intoxalock Customer Support at 877-272-5195