How to Use Your Intoxalock Ignition Interlock Breathalyzer

If you have been convicted of a DUI-related offense, you might be required to submit a breath test to an ignition interlock device (IID) before starting your vehicle. Additionally, commercial breathalyzers provide a convenient, portable way to self-test your breath alcohol concentration (BrAC).

If you have an ignition interlock device in your car, you are required to pass a breath test before operating your vehicle.

• To use your ignition interlock device, press the button on the handheld unit and wait until the LED display shows the word “Blow.” Follow the command and blow a long breath into the mouthpiece. Most states require you to submit a blow, inhale, blow breath pattern. However, some states require you to simply blow one long breath into the device. Check your state’s requirements and the user manual of your Intoxalock ignition interlock device.
• 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.
• While you are driving, a retest will be required. All states require these mandated retests to be submitted while the vehicle is running. The interlock device will ask for a retest at randomly-spaced time intervals by producing a loud beep and showing a message 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 the retest, the ignition interlock will not turn the vehicle off while in motion, but it will give a signal for you to stop driving.