S.D. Codified Laws § 16-18-2.5
A legal intern or extern may appear in any civil, criminal, or quasi-criminal matter on behalf of the state, a county, or a first or second class municipality with the written approval of the attorney general, state's attorney, or city attorney, as the case may be. The legal intern or extern shall be under the supervision of the approving attorney, or of a deputy or assistant thereof, who has the responsibility as supervising lawyer. The approval may be for a specific case or matter or may be general for a series or type of cases or matters as appears in order to the approving attorney. The approval may be withdrawn at any time by the approving attorney without notice, hearing, or cause stated; and the withdrawal shall be filed pursuant to § 16-18-2.8. Unless the court orders otherwise, the appearance by the legal intern or extern may be in the absence of the supervising lawyer.
SDCL 16-18-2.5