What is an ignition interlock device?

An ignition interlock device (IID) is a system installed in vehicles to prevent people from driving while under the influence of alcohol. This device requires the driver to blow into a breathalyzer before the car engine will start. The IID is connected to the ignition, and it will not allow the car to start unless the driver blows a breath sample with a blood alcohol content (BAC) lower than a preset limit. This limit is set by the state and can vary. In Texas, the limit is set to 0.02 BAC. If the IID detects a BAC above the preset limit, the car will not start and the driver will be unable to operate the vehicle. Some IIDs can also randomly prompt the driver to blow into the breathalyzer while the vehicle is in operation, and if the driver refuses or the breath sample has an elevated BAC, the car’s engine will shut down. IIDs are most commonly used by drivers who have been convicted of driving under the influence (DUI) in Texas. It may be a requirement for the driver to have the IID installed in their vehicle for a certain period of time or for the duration of the driver’s license suspension.

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What is an ignition interlock device?

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