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An ignition interlock device (IID) is a small handheld car breathalyzer device that measures the amount of alcohol in the user’s breath. Installing one is a common requirement following a drunk driving offense (DUI, DWI, DUI, OWI, or OVI).

In simplest terms, an interlock is an in-car breathalyzer that prevents a user from starting a vehicle until a breath alcohol test is taken. An ignition interlock device is the proper term for devices sometimes referred to as “in car breathalyzer” or “car interlock” or “blow and go”. LifeSafer is the premier provider of all these systems at low cost in almost 2,000 convenient locations.

If the IID registers the results of the breath test ( BAC or Blood Alcohol Concentration) 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 length between these appointments is determined by state law, but typically occurs every 30, 60, or 90 days.

Interlocks can vary in a few ways and the ignition interlock clients receive depends on the legal requirements set by the state they live in and the specifics of their DWI/DUI/OWI. Their interlock may come equipped with or without a camera, as well as real-time reporting or other additional features. LifeSafer is approved to provide car ignition interlock systems in 45 states.

What is an Ignition Interlock Device 

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