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Ignition Interlocks - What You Need To Know: A Toolkit for ...
www.nhtsa.govAn on-board computer analyzes the alcohol concentration of the driver’s breath to determine if it is below the set point, usually .02 grams per deciliter, before the vehicle will start. If the test registers above the set point or the person does not provide a breath sample, the interlock will prevent the vehicle’s engine from starting.