We know who the dangerous drunk drivers are. According to the National Hardcore Drunk Driving Project:
Hardcore drunken drivers are those who drive with a high blood alcohol concentration (BAC) of .15 or above or who do so repeatedly, as demonstrated by having more than one impaired driving arrest, and who are highly resistant to changing their behavior despite previous sanctions, treatment or education.
We also know how dangerous these people can be.
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Hardcore drunk drivers are responsible for