S.D. Codified Laws § 11-7-102
The state and all public officers, municipal corporations, political subdivisions, and public bodies, all banks, bankers, trust companies, savings banks and institutions, investment companies, insurance companies, insurance associations, and other persons carrying on a banking or insurance business, and all personal representatives, guardians, trustees, and other fiduciaries may legally invest any moneys or funds belonging to them or within their control in any bonds or other obligations issued by a Housing and Redevelopment Commission created by or pursuant to this chapter, when such bonds or other obligations are secured by a pledge of annual contributions or other financial assistance to be paid by the United States government or any agency thereof, and such bonds and other obligations shall be authorized security for all public deposits; it being the purpose of this chapter to authorize any of the foregoing to use any funds owned or controlled by them, including (but not limited to) sinking, insurance, investment, retirement, compensation, pension and trust funds, and funds held on deposit, for the purchase of any such bonds or other obligations; provided, however, that nothing contained in this chapter shall be construed as relieving any person, firm, or corporation from any duty of exercising reasonable care in selecting securities. The provisions of this chapter shall apply notwithstanding any restrictions on investments contained in other laws.
SDCL 11-7-102