Interlock Devices

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What is an interlock?

An interlock is a small handheld device that measures the amount of alcohol in the user’s breath. If the device registers over the pre-set limit, the vehicle will not start. If the driver’s breath test is below the pre-set limit, the vehicle will start. The interlock device needs to be serviced and calibrated at an authorized service center regularly.

The Invention of The Interlock Device The Borg-Warner corporation created a working prototype that had a BAC sample tester which was able to interrupt a vehicle engines starting circuit. The device was inspired by the Immobilizer, an alarm system created in 1919 by George Evans and Edward Birkenbue

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What is an interlock program?

Interlock programs vary by state but in general, they all require some combination of the following: obtain a special license, install the device, test-taking, device calibration, results reported to monitoring agencies, compliance, and removal upon completion.

How does an interlock work?

An interlock tests for the presence of alcohol in your breath. If it detects alcohol, it prevents your car from starting. While you will be required to take periodic tests during your drive, an interlock will never stop your car while you are driving.

Where do I get an interlock?

Local auto-related service shops have received extensive training from our dedicated operations team. They install and service your leased LifeSafer interlock.

Using an Interlock

Be confident using your Interlock

It can take practice and patience when learning how to use an interlock. The entire LifeSafer team is committed to making using your interlock easy and intuitive. This step by step guide below reviews how to successfully use your device. Give yourself extra time, especially during the first month of use. Soon using your interlock will become a regular part of your routine.


Turn your key halfway to power up the device. Take a drink of water to rinse your mouth. Take a nice deep breath and prepare to take your test. You will have one minute to blow into the device.


Relax and blow steadily into the device for 5 to 7 seconds. The device will emit a tone, indicating that you are doing the test correctly. You will hear a second beep and click to signal the sample is sufficient.


Once you see the “PASS” message on your device, start your vehicle and get going. You will be prompted for rolling retests during your drive.