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Updated February 12, 2014

Definition: As it is related to drunk driving laws, impaired means that a driver's abilities are diminished. In some states, a driver can be arrested for driving while impaired--even if his blood alcohol content is below the .08 level of legal intoxication--if the arresting officer believes his abilities are impaired.
Also Known As: Impairment
Driving skill levels become somewhat impaired long before the blood alcohol content reaches .08.
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