DUI is not limited to one substance
Washington's DUI statute addresses intoxicating liquor, cannabis, other drugs, and combined influence. It includes both measured concentration provisions and driving while affected.
Read RCW 46.61.502Washington safety rules
Washington DUI and distracted-driving rules
Study these rules with the same care as signals and right of way: read the current law, notice definitions and exceptions, and do not rely on an old summary.
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State-specific details
Washington separates several kinds of unsafe driving
The statutes cover measurable concentration, actual impairment, combined influence, and device use as distinct legal questions.
Sources checked July 28, 2026
A lawful drug can still affect driving
The statute states that being entitled to use a drug under Washington law does not by itself defend against a DUI charge. Focus on whether driving falls within the statute.
Read RCW 46.61.502Device use has specific exceptions
Using a personal electronic device while driving on a public highway is generally an infraction. The statute lists limited exceptions, including contacting emergency services.
Read RCW 46.61.672Primary sources
Check the current RCW
Washington's impairment and personal-electronic-device provisions are published in Chapter 46.61 RCW. Use the official text for current definitions, scope, and exceptions.
Put it into practice
Practice source-linked explanations
Use the free preview to practice applying the current rule and reviewing the explanation behind each answer.