There are various criminal charges for operating a motorized, electric, or otherwise-powered transportation device on public roadways or waterways while under the influence of or intoxicated by drugs or alcohol, as defined by state law. DUI, DWI, OUI, OWI, and BUI—driving under the influence, driving while intoxicated, operating under the influence, operating while intoxicated, and boating under the influence—are some of the common names for such impaired-driving or impaired-operating criminal offenses.

Laws regarding the definitions and names of such alcohol and drug-related driving offenses vary from state to state and are usually located in a state’s statutes—often in the penal code or criminal code.

In Idaho, the primary statute governing driving under the influence (DUI) is Idaho Code § 18-8004. This law makes it illegal for any person to drive or be in actual physical control of a motor vehicle while under the influence of alcohol, drugs, or any other intoxicating substances, or with a blood alcohol concentration (BAC) of 0.08% or higher. The term DUI is commonly used in Idaho to refer to these offenses. Idaho does not use the terms DWI (driving while intoxicated), OUI (operating under the influence), or OWI (operating while intoxicated) in its statutes. For boating under the influence, Idaho Code § 67-7035 addresses BUI (boating under the influence) and prohibits operating a vessel on waterways while under the influence of alcohol, drugs, or other intoxicating substances. Penalties for DUI and BUI in Idaho can include fines, jail time, driver's license suspension, and mandatory substance abuse evaluations or treatment programs, depending on the severity of the offense and whether it is a first or subsequent violation.