S.D. Codified Laws § 36-4-29
The Board of Examiners may cancel, revoke, suspend, or limit the license, resident license, or certificate of any physician or surgeon issued under this chapter upon satisfactory proof by a preponderance of the evidence in compliance with chapter 1-26 of such a licensee's, resident licensee's, or certificate holder's professional incompetence, or unprofessional or dishonorable conduct, or proof of a violation of this chapter in any respect. However, the board may not base a finding of unprofessional or dishonorable conduct solely on the basis that a licensee, resident licensee, or certificate holder practices chelation therapy.
For the purposes of this section, professional incompetence is a deviation from the statewide standard of competence, which is that minimum degree of skill and knowledge necessary for the performance of characteristic tasks of a physician or surgeon in at least a reasonably effective way.
SDCL 36-4-29