Chapter 4: DUI / DWI Laws

Driving Under the Influence (DUI) is one of the most dangerous behaviors on the road, leading to thousands of preventable deaths and injuries each year. Wyoming enforces strict laws with severe penalties to deter impaired driving and remove dangerous drivers from public roadways. Understanding these laws is critical for all drivers, as a single DUI conviction can have life-altering legal, financial, and personal consequences.

In Wyoming, a driver can be convicted of Driving While Under the Influence (DWUI) for operating or being in actual physical control of a vehicle while impaired by alcohol, a controlled substance, or a combination of both, to a degree that renders them incapable of safely driving. The state’s laws are designed to be tough, with penalties increasing significantly for repeat offenses.

DUI & Implied Consent

The foundation of Wyoming’s enforcement rests on Blood Alcohol Concentration (BAC) limits and the principle of Implied Consent.

Defining DUI

A person is considered under the influence if their ability to drive is impaired. While this can be proven by observation, law enforcement typically uses chemical tests to establish a per se violation, meaning a driver is legally intoxicated at a certain BAC level, regardless of whether their driving appeared impaired. This applies to impairment from illegal drugs, prescription medication, or over-the-counter drugs, not just alcohol.