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 South Dakota, the laws that apply to driving under the influence (DUI) of alcohol or drugs are generally focused on motor vehicles and do not explicitly include bicycles. South Dakota Codified Laws (SDCL) define a vehicle for DUI purposes as a device in, upon, or by which any person or property is or may be transported or drawn upon a highway, excepting devices moved by human power. Therefore, traditional DUI laws do not typically apply to cyclists. However, cyclists could potentially be charged under public intoxication or other relevant laws if their behavior while cycling under the influence poses a danger to themselves or others. It is important to note that while there may not be a specific cycling under the influence (CUI) law in South Dakota, cycling while impaired is still dangerous and can lead to legal consequences.