Driving after a DUI conviction can be a dicey experience. Many states require drivers, if they want to keep using their cars, to install ignition interlock devices that measure alcohol levels before allowing the vehicle to start.
One of the most common is from Des Moines, Iowa-based Intoxalock, which takes the form of a small box with a plastic tube into which the driver blows. The box then measures the level of alcohol in the breath. You must be below your state's legal limit to start the vehicle. (In some states, the system will also log your location using GPS and/or take a photo of you every time you blow in the tube.)
The interlock device can only be leased, and it costs around $70–$120 per month.
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Source: Ars Technica
