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 Missouri, the laws that apply to driving under the influence of alcohol or drugs (DUI/DWI) do not explicitly include bicycles. Missouri's DWI statutes typically apply to 'persons operating a motor vehicle' on roadways or waterways. Since a bicycle is not considered a motor vehicle, the state's DWI laws do not directly apply to cyclists. However, this does not mean that riding a bicycle under the influence is without consequence. Cyclists may still be subject to public safety laws, and if their behavior constitutes a danger to themselves or others, they could potentially be charged with other offenses such as disorderly conduct or public intoxication. It is important for cyclists to be aware of their own safety and the safety of others on the road, regardless of the specific legal statutes regarding cycling under the influence.