Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.
Almost all states have some sort of ignition interlock law. At the launch of HP 2020, Alabama and South Dakota do not have an ignition interlock law. A number of States—have mandatory ignition interlock provisions for all offenses. Other States offer a strong incentive to install an interlock device on the first conviction. Hawaii’s mandatory ignition interlock law goes into effect in 2011.
Additional resources about the objective.
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