S.D. Codified Laws § 27B-10-5
At a hearing ordered pursuant to § 27B-10-4, the person whose condition is the subject of the hearing shall be represented by counsel and, if the person is financially unable to obtain adequate representation, the court must appoint counsel for the person. The person has the right to appear personally, to subpoena witnesses on the person's behalf, to confront and cross-examine witnesses, and to present evidence. The person has the right to testify but may not be compelled to testify. If the person chooses not to appear, the person's attorney must state on the record that the person has been informed of the hearing and of the right to appear and chooses not to exercise this right. Documentation of the reasons for the person's decision is not required. If the person is receiving treatment at the time of hearing, the person's provider must take all reasonable precautions to ensure that, at the time of the hearing, the person is not so under the influence of, or so affected by, drugs, medication, or other treatment or interventions, as to be hampered in preparing for or participating in the hearing. The court may exclude any person not necessary for the conduct of the proceedings from the hearings, except any person requested to be present by the person who is the subject of the hearing.
SDCL 27B-10-5