S.D. Codified Laws § 1-25-1.5

Any official meeting may be conducted by teleconference. A teleconference may be used to conduct a hearing or take final disposition regarding an administrative rule pursuant to § 1-26-4. A member is deemed present if the member answers present to the roll call conducted by teleconference for the purpose of determining a quorum. Each vote at an official meeting held by teleconference may be taken by voice vote. If any member votes in the negative, the vote shall proceed to a roll call vote.