What is an ignition interlock device?

An ignition interlock device (IID) is a breathalyzer installed in a motor vehicle that measures the driver’s breath alcohol concentration (BrAC). If the BrAC recorded by the IID is above the legal limit, the vehicle will not start. Washington was the first state to enact a law in 1986 requiring IIDs for convicted drunk drivers. The device is typically installed in the dashboard, and requires the driver to provide a breath sample before the vehicle will start. The breath sample is analyzed, and if the BrAC is below the legal limit, the vehicle will start. The IID must remain in the vehicle for a certain period of time – this varies depending on the conviction – and the driver must regularly provide breath samples during drives. If the BrAC is above the legal limit, the vehicle will not start until the driver provides a breath sample below the legal limit. IIDs are used as a deterrent to prevent drunk driving. These devices have been proven to reduce drunk driving re-offenses by 60-80%. In Washington, anyone convicted of a DWI is required to install an IID in their vehicle. Overall, ignition interlock devices are a useful tool to prevent drunk driving. They ensure that a driver’s BrAC is below the legal limit before they can start the vehicle, which significantly reduces the risk of drunk driving and keeps roads and highways safer.

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What is an ignition interlock device?

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