S.D. Codified Laws § 1-11-5
The attorney general is also authorized to appoint assistant attorneys general as he may deem necessary on a part-time basis for special assignments. The attorney general shall fix their compensation and the expenditures for such appointments may be made from whatever appropriation or source that may be made available to the attorney general. The appointment of such assistants shall be in writing and filed in the Office of the Secretary of State. Such assistant attorneys general shall have the power and authority specifically delegated to them by the attorney general in writing. Such assistant attorney general shall, before entering upon the duties of his office, take and subscribe the official oath prescribed by the Constitution.
SDCL 1-11-5