What is an ignition interlock device?

An ignition interlock device (IID) is a device that measures the breath alcohol concentration (BAC) of a driver. It is installed in the vehicle of a driver who has been convicted of driving under the influence (DUI) of alcohol. In Virginia, anyone convicted of a DUI is required to install an IID in their vehicle and maintain it for a certain period of time. When attempting to start the vehicle, the driver must blow into the device and the results are used to determine if the driver is under the influence of alcohol. If the BAC is higher than a pre-set level, the vehicle will not start. In addition, the IID requires the driver to periodically blow into the device while operating the vehicle. If the driver does not blow into the device, or if the BAC is higher than the pre-set level, the IID will sound an alarm, record the incident, and shut off the engine. By using IIDs, Virginia has been successful in reducing the number of DUI-related incidents and deaths. The IID is a reminder to drivers and helps them to stay focused while driving. As a result, they are less likely to engage in dangerous behaviors that could put their lives and the lives of others at risk.

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