South Dakota Codified Laws
Chapter 24 - Supreme Court Procedure In General
Section 15-24-4 - Number of judges required for decision--Rehearing--Disposition in case of disagreement.

15-24-4. Number of judges required for decision--Rehearing--Disposition in case of disagreement.
The concurrence of three judges of the Supreme Court is necessary to pronounce a decision. If three do not concur the cause must be reheard; and if on the second hearing three judges do not concur, the judgment or order appealed from must be affirmed; or, in case of an original action or proceeding, the same must be dismissed without prejudice.

Source: SDC 1939 & Supp 1960, ยง33.0502.