Blood alcohol limits — South Dakota Permit Test

Blood alcohol limits on the South Dakota permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.

The rules

A blood alcohol concentration of 0.08% (0.02% if under 21) or more is evidence that you were driving under the influence of alcohol.

At that level your eyes, hands and judgment are slowed enough to miss a stopped car.

A Blood Alcohol Concentration of 0.08% (0.02% if under 21 years of age) or more is evidence that you were driving under the influence of alcohol.

South Dakota Driver License Manual, p.20

You do not have to be driving: anyone in physical control of a vehicle can be arrested if their BAC is over the legal limit.

A drunk person sitting at the wheel with the engine running can roll the car into traffic.

If you have physical control of a vehicle (you don’t have to be driving) you can be arrested if your blood alcohol concentration (BAC) is over the legal limit.

South Dakota Driver License Manual, p.20

BAC is the percentage of alcohol in relation to the amount of blood in your body.

Drivers who guess their state by how they feel are often far more impaired than they think.

A BAC is the percentage of alcohol in relation to the amount of blood in your body.

South Dakota Driver License Manual, p.20

Even under 0.08% BAC you are still impaired, and under state law you can still be convicted for driving impaired.

A driver at 0.06% still reacts late and can kill someone, so the law can still convict.

Even under 0.08%, you are still impaired.

South Dakota Driver License Manual, p.20

On the test

For a driver 21 or older, what BAC is evidence of driving under the influence?

0.08% or more. At that level your eyes, hands and judgment are slowed enough to miss a stopped car. South Dakota Driver License Manual, p.20: “A Blood Alcohol Concentration of 0.08% (0.02% if under 21 years of age) or more is evidence that you were driving under the influence of alcohol.”

How this works

Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.

You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.

Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.

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Where these come from

Every rule here is checked against South Dakota Driver License Manual, published by the South Dakota Department of Public Safety, and against the state code itself. Last checked 2026-10-04.