Drunk driving in the United States

"Drunk driving" is the act of operating or driving a motor vehicle while under the influence of alcohol or drugs to the degree that mental and motor skills are "impaired". It is illegal in all jurisdictions within the United States, though enforcement varies widely between and within states/territories, to drive a motor vehicle while impaired or with a breath or blood alcohol concentration of 0.08% or greater if over the age of 21.

The specific criminal offense is usually called driving under the influence (DUI), and in some states 'driving while intoxicated' (DWI), 'operating while impaired' (OWI), or 'operating a vehicle under the influence' (OVI). Such laws may also apply to boating or piloting aircraft. Vehicles can include farm machinery and horse-drawn carriages.

In construing the terms DUI, DWI, OWI and OVI, one may notice that some states therefore make it illegal to drive a motor vehicle while under the influence or driving while intoxicated while others indicate that it is illegal to operate a motor vehicle. There is a split of authority across the country regarding this issue. Some states permit enforcement of DUI, DWI and OWI/OVI statutes based on "operation and control" of a vehicle, while others require actual "driving". "The distinction between these terms is material, for it is generally held that the word 'drive,' as used in statutes of this kind, usually denotes movement of the vehicle in some direction, whereas the word 'operate' has a broader meaning so as to include not only the motion of the vehicle, but also acts which engage the machinery of the vehicle that, alone or in sequence, will set in motion the motive power of the vehicle." (State v. Graves (1977) 269 S.C. 356 [237 S.E.2d 584, 586-588, 586. fn. 8]

In California, for instance, in Mercer v. DMV (1991) 53 Cal.3d 753, the California State Supreme Court contrasted the term “drive,” commonly understood to require volitional movement of the vehicle, with the term “driver,” defined in California Vehicle Code § 305 as one who is either driving or in actual physical control. The court pointed out that the phrase “actual physical control” does not appear anywhere in the drunk driving offense statutes. Further, the court noted that since “driver” is defined as one who drives or is in actual physical control, the two terms (drive vs. actual physical control) must have different meanings. Construing these penal statutes strictly, rather than broadly, as is required by Keeler v. Superior Court of Amador County (1970) 2 Cal.3d 619, 631, the court held that mere actual physical control is not enough to constitute driving. Therefore, the term: “drive”, at least for purposes of the drunk driving statutes, requires volitional movement of the vehicle. In coming to this conclusion, the California Supreme Court held that in everyday usage the phrase, "to drive a vehicle," is understood as requiring evidence of volitional movement of a vehicle. Numerous dictionary definitions-including Webster's Third New International Dictionary (1981), cited by the Court of Appeal in the case that led to the California Supreme Court's review of this case, support a definition of "drive" that includes movement. (See, e.g., Id., at p. 692.) fn. 5. The Mercer Court held that it believed that these definitions are consistent with the usual and ordinary understanding of that term, and suggest the sense in which the word was intended by the Legislature in the present context.

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