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The legal term that refers to being unable to operate a vehicle due to alcohol consumption is drunk driving. This term specifically denotes the impairment caused by alcohol, which affects a person's ability to safely control and operate a vehicle, thus posing a danger to themselves and others on the road.

In legal definitions, drunk driving is often associated with blood alcohol concentration (BAC) levels that exceed the legal limit, which varies by jurisdiction but typically is set at 0.08% in many places. The categorization of this offense can lead to severe legal consequences, including fines, license suspension, and imprisonment, as well as additional penalties if injuries or fatalities occur due to the impaired driving.

The other terms do not accurately capture the situation of impaired driving due to alcohol. Innocent driving suggests the absence of any wrongdoing, somnambulism refers to sleepwalking which has no relation to alcohol impairment, and careless driving encompasses a broader spectrum of reckless behavior on the road that doesn't specifically denote impairment from substances.