Ignition interlock devices, also called breath alcohol ignition interlock device or BAIID, are devices installed on motor vehicle dashboards and in which the driver must exhale into for the car to start.
The software in the device will analyze the breath for the breath-alcohol concentration and if this is greater than the blood alcohol concentration that is programmed (0.02% or 0.04%), the engine will not start. The BAIID will require other samples at random times after the engine has started.
Most of these devices use ethanol-specific fuel cells for sensors. The logs from the device are stored for downloading or printing out for analysis by the authorities. The sensors are calibrated at 1, 2, or 3-month intervals. If there is a violation, the authorities can impose additional sanctions.
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