You need to contact an attorney specializing in DUI. Don't spend your time trying to figure out what will happen. There are deadlines that you should not miss. An attorney will keep you on track and address these and whatever other questions you have.
The answer is on the spectrum between "possibly" and "likely." It would depend upon additional factors like what you were drinking, how much you had to drink before you stopped, etc., but also some other factors like weight and gender.
The key things to remember are 1.) the law prohibits DRIVING while having .08% or more by weight of alcohol in your blood, and that 2.) you can be convicted of DUI in South Dakota if you were under the influence of alcohol (or other things) at the time you were driving. While a lower blood test result will be in your favor, you're not automatically entitled to a dismissal if it comes back under a .08%. The prosecution will have a chemist who will try to back-extrapolate to a reasonable degree of scientific certainty what your blood alcohol content would have been at the time of your driving based upon the time your blood was drawn and the blood alcohol content.
For those reasons, consider either hiring an experienced criminal defense attorney near you, or else applying for a court-appointed attorney if you cannot afford one.
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