Washington MAST (Mandatory Alcohol Server Training) Practice Exam

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Driving under the influence (DUI) refers to operating a motor vehicle under the influence of or affected by?

Intoxicating liquor, marijuana, or any drug or the combined influence
Only intoxicating liquor
Only marijuana
Only prescription drugs

The correct answer is: Intoxicating liquor, marijuana, or any drug or the combined influence

Driving under the influence (DUI) refers to operating a motor vehicle while under the influence of substances that can impair one's ability to safely operate a vehicle. While option A correctly includes all of the mentioned substances (intoxicating liquor, marijuana, and any drug) and acknowledges that they can have a combined influence, the other options are incorrect. Option B is too narrow as it only mentions intoxicating liquor and does not consider other substances that can impair driving ability. Option C is also too narrow as it only mentions marijuana, neglecting other potentially impairing substances. Option D is also incorrect because it only mentions prescription drugs and ignores the fact that intoxicating liquor and marijuana can also impair one's ability to drive safely. Therefore, option A is the most correct and comprehensive answer.