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driving under the influence
the offense of operating a motor vehicle while intoxicated by drugs or esp. alcohol called also driving while intoxicated drunk driving drunken driving NOTE: Most states specify by statute a level of alcohol in the blood that creates a presumption that the person is under the influence of alcohol. The blood alcohol content is required to be .10 percent in most states.
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.