S.D. Codified Laws § 1-25-9

No member of the commission may participate as part of the commission or vote on any action regarding a violation of this chapter if that member reported or was involved in the initial investigation, is an attorney for anyone who reported or was involved in the initial investigation, or represents or serves as a member of the governmental entity about whom the referral is made. The provisions of this section do not preclude a commission member from otherwise serving on the commission for other matters referred to the commission.