S.D. Codified Laws § 41-13A-5
To prevent the introduction, importation, infestation, and spread of aquatic invasive species, the department may establish aquatic invasive species inspection stations at any location within the state including interstate borders, highways or other roads, locations adjacent to or near public waters, and at department offices. Any person with a conveyance is required to stop at an inspection station. The department shall receive approval from the Department of Transportation before establishing an inspection station along any road that is part of the state trunk system.
Failure to comply with the provisions of this section is a Class 2 misdemeanor. A second or subsequent violation of this section within one year is a Class 1 misdemeanor.
SDCL 41-13A-5