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What is an Intoxalock ignition interlock device?

Intoxalock legacy device

An ignition interlock device is a breathalyzer that is installed in your vehicle to prevent drinking and driving. It is made up of a mouthpiece, a handheld unit and a cord that attaches to your vehicle’s ignition system. You are required to blow into the mouthpiece to test your Breath Alcohol Concentration (BrAC) before starting your car.

If your BrAC is below the limit set by your state, your vehicle will start. If your BrAC is above your state’s limit, your vehicle will not start until you submit a breath sample that no longer detects alcohol.

All activity is stored in the device and sent to your monitoring department (court, DMV, probation officer, etc.). With real-time reporting capabilities, Intoxalock is able to upload data immediately to our Log Reporter website. Some states require the information to be made available immediately, while others require the data to be sent monthly.

Intoxalock legacy device

How to use an ignition interlock device video


Step by step instructions

To use your ignition interlock device, press the button on the handheld unit and wait until the LED displays “Blow.” Most states require you to submit a blow, inhale, blow breath pattern into the mouthpiece. Some states require you to just blow into the device. Check your User’s Manual for detailed instructions.

All states require mandated retests to be submitted while the vehicle is running. The interlock device will ask for a retest at randomly spaced time intervals with a loud beep and a message displayed on the LED screen of the handheld. The user must submit another breath sample each time a retest is requested. If alcohol is detected during a retest, your ignition interlock will not turn off your vehicle while it is in motion but it will give a signal for you to stop.

Intoxalock device accuracy

Intoxalock uses fuel cell technology in all devices to ensure the highest levels of accuracy and reliability. Check your state’s requirements to see which products are approved in your state.

Ignition interlock
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