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A car breathalyzer device is also called Ignition Interlock Device. It's about the size of a cell phone and is connected to the ignition system. Before starting the vehicle you need to blow into the device to submit a breath sample. The device measures the alcohol level and makes sure it's below the pre-set limit, otherwise the device will prevent the vehicle from starting.

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Q: How does one use a car breathalyzer?
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