Some states have laws against riding a bicycle on a street or highway while under the influence of drugs or alcohol (cycling under the influence, or CUI). Other states apply traditional DUI/DWI laws to cycling while under the influence of drugs or alcohol. And some states don't have a specific CUI law, and don't apply traditional DUI/DWI laws to riding a non-motorized vehicle, such as a bicycle.
In Oregon, the laws that apply to driving under the influence of intoxicants (DUII) also apply to cyclists. Under Oregon law, a bicycle is considered a vehicle, and the same DUII statutes that apply to motor vehicle drivers also apply to bicycle riders. This means that if a person is found to be riding a bicycle on a public roadway while under the influence of alcohol, a controlled substance, or an inhalant, they can be arrested and prosecuted for DUII. The legal blood alcohol concentration (BAC) limit in Oregon is 0.08%, and this limit applies to both drivers of motor vehicles and cyclists. Penalties for cycling under the influence in Oregon may include fines, imprisonment, and mandatory participation in a drug or alcohol treatment program.