S.D. Codified Laws § 27B-3-42

Any person in a state facility may be transferred to any other state or private facility if the person would benefit from the treatment offered at the facility. A transfer may only be made with the mutual consent of both facilities or agencies. No transfer may occur until all reasonable efforts have been made to consult with the person and the person's nearest relative or guardian. However, the transfer may be effected earlier if necessitated by an emergency. If an emergency situation arises, the required notice shall be given as soon as possible thereafter.