S.D. Codified Laws § 34-29A-6
In addition to the deputy boiler inspectors authorized by § 34-29A-4, the Department of Public Safety shall, upon the request of any company licensed to insure and insuring in this state boilers, issue to any inspectors of said company commissions as special inspectors, provided that each inspector before receiving his commission shall satisfactorily pass the examination provided for by § 34-29A-9, or, in lieu of the examination, shall hold a commission or a certificate of competency as an inspector of boilers for a state that has a standard of examination substantially equal to that of the State of South Dakota or a commission as an inspector of boilers issued by the National Board of Boiler and Pressure Vessel Inspectors. Each special inspector commission issued by the department shall, unless revoked, remain effective for a period of three years. The department shall issue a new commission as special inspector upon the request of companies specified in this section. Special inspectors are not required to pass the examination provided for by § 34-29A-9 more than once.
SDCL 34-29A-6