S.D. Codified Laws § 5-18A-17
No state officer or employee who approves, awards, or administers a contract on behalf of a state agency, may have an interest in a contract or derive a direct benefit from a contract that is within the scope of the officer's or employee's official duties, nor for a one-year period following the end of their employment or position as a state officer may the officer or employee derive a direct benefit as a result of such contract except as provided in § 5-18A-17.2. In addition, no such officer or employee may enter into any contract, other than a contract of employment, with any state agency for a period of one year following their leaving office or employment except as provided in § 5-18A-17.3. This prohibition includes any state officer or employee who, in his or her official capacity, recommends the approval or award of the contract or who supervises a person who approves, awards, or administers the contract. This prohibition does not include any state officer who serves without compensation or who may be paid per diem pursuant to § 4-7-10.4.
SDCL 5-18A-17