S.D. Codified Laws § 33-10-89

If a special court-martial, other than a special court-martial composed of a military judge only, is reduced below three members, the trial may not proceed unless the convening authority details new members sufficient in number to provide not less than three members. The trial shall proceed with the new members present as if no evidence had been introduced previously at the trial, unless a verbatim record of the evidence previously introduced before the members of the court or a stipulation thereof is read to the court in the presence of the military judge, the accused, and counsel for both sides.