South Dakota DUI Laws, Penalties, & Fines
South Dakota DUI law chapter 32-23 states that it is against the law for any person to drive a motor vehicle in the state of South Dakota while they are under the influence of alcohol or drugs with a blood alcohol concentration level of .08% or greater.
It is not necessary for a person who has been stopped on suspicion of driving under the influence to display the signs one would typically associate with someone who is under the influence. Just the fact that a chemical test shows a blood alcohol concentration level of .08% or greater will get you arrested for DUI in South Dakota.
It should also be noted that a person could still be arrested for driving under the influence in South Dakota even if their blood alcohol concentration level is below the legal limit of .08% just by displaying signs that are consistent with a person who is under the influence of alcohol or drugs.