S.D. Codified Laws § 11-2-17.3
A county zoning ordinance adopted under this chapter that authorizes a conditional use of real property shall specify the approving authority, each category of conditional use requiring approval, the zoning districts in which a conditional use is available, the criteria for evaluating each conditional use, and any procedures for certifying approval of certain conditional uses. The approving authority shall consider the stated criteria, the objectives of the comprehensive plan, and the purpose of the zoning ordinance and the relevant zoning districts when making a decision to approve or disapprove a conditional use request. Approval of a conditional use request requires the affirmative majority vote of the members of the approving authority who are present and voting.
SDCL 11-2-17.3