S.D. Codified Laws § 2-7-5
The director of the Legislative Research Council shall, in accordance with rules adopted by the Legislature, receive the prefiled bills and resolutions, place them in proper form, and assign them numbers for introduction in the proper house. The director shall electronically deliver each bill and resolution to the secretary of the Senate or the chief clerk of the House of Representatives, as the case may be, on the day when the session convenes. However, the director may not deliver any prefiled bill or resolution until every sponsor of the bill or resolution has been duly sworn into office.
Upon prefiling, the bills and resolutions become the property of the Legislature and may not thereafter be withdrawn. Prefiled bills and resolutions shall be considered as introduced on the first legislative day.
SDCL 2-7-5