South Dakota DWI & DUI Laws
BAC limits, penalties, license suspension periods, and ignition interlock requirements for South Dakota drivers.
State Guide
South Dakota DUI Laws at a Glance
Impaired driving is prosecuted under DUI in South Dakota, with a 0.08% BAC threshold. The penalty structure that follows a conviction (license suspension, interlock requirements, how prior offenses are counted) is entirely state-specific.
| Detail | South Dakota Rule | Notes |
|---|---|---|
| Statutory Term | DUI | The specific offense name and code section vary by state |
| Standard BAC Limit | 0.08% | The standard threshold used in nearly every state |
| First-Offense License Suspension | 1 month | Administrative and criminal suspensions can run separately; actual length depends on case specifics |
| Ignition Interlock Device | Not mandatory | Not mandatory statewide, though a court may still order one |
| Lookback Period | Not consistently published | Confirm the current lookback window against state code. This figure is not consistently published across states |
How BAC Testing and Implied Consent Work
BAC is measured through a breath, blood, or urine test under "implied consent" laws that exist in every state: driving on public roads counts as consent to testing when there's a lawful arrest for suspected impairment. Refusal triggers its own penalty, typically an automatic suspension, independent of the underlying DUI case.
License Suspension: Two Separate Tracks
A DUI arrest in South Dakota can trigger two separate tracks, an administrative suspension through the motor vehicle agency that moves quickly and independently of the courtroom process, and the criminal case itself. For a first offense, South Dakota's suspension period is 1 month.
Common Questions
Frequently Asked Questions: DUI in South Dakota
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What is the BAC limit in South Dakota?South Dakota's standard illegal BAC threshold is 0.08%. This matches the standard used in nearly every U.S. state. Commercial drivers and drivers under 21 face lower thresholds in every state, including South Dakota.
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How long is a license suspended for a first DUI offense in South Dakota?South Dakota's first-offense suspension period is generally 1 month. This can involve both an administrative suspension (handled by the state's motor vehicle agency, often starting soon after arrest) and consequences tied to the criminal case itself, which can run on a different timeline.
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Does South Dakota require an ignition interlock device?In South Dakota, an ignition interlock device is not mandatory statewide, though a court may still order one. Requirements can also depend on whether a high BAC was involved or whether it's a repeat offense.
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What does "DUI" mean in South Dakota?DUI is South Dakota's statutory term for operating a vehicle while impaired by alcohol or drugs above the legal threshold. Different states use different terms (DUI, DWI, OWI, OUI, OVI, and others) for what is fundamentally the same category of offense, though the exact legal definitions and penalty structures differ by state.
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What happens if I refuse a BAC test in South Dakota?Like every state, South Dakota has an implied consent law: refusing a lawfully requested BAC test after a DUI arrest triggers its own penalty, typically an automatic license suspension, separate from and in addition to any penalty from the underlying charge itself.
Sources & References
- National Highway Traffic Safety Administration, Drunk Driving official program overview
- Insurance Institute for Highway Safety, Alcohol Interlock Laws by State
- South Dakota BAC limit, suspension period, and interlock requirement figures compiled from published state-by-state legal reference tables; confirm current figures against official SD state code before relying on them
- Governors Highway Safety Association, Alcohol-Impaired Driving State Laws