S.D. Codified Laws § 46A-1-47

The state and all counties, municipal corporations, political subdivisions, and public bodies, and public officers of any thereof, all banks, subject to applicable investment limitations, bankers, trust companies, savings banks and institutions, building and loan associations, savings and loan associations, investment companies, and other persons carrying on a banking business, all insurance companies, insurance associations, and other persons carrying on an insurance business, and all personal representatives, conservators, trustees, and other fiduciaries may legally invest any debt service funds, moneys, or other funds belonging to them or within their control in any bonds issued pursuant to this chapter, it being the purpose of this section to authorize the investment in such bonds of all debt service, insurance, retirement, compensation, pension, and trust funds, whether owned or controlled by private or public persons or officers. However, nothing in this section may be construed as relieving any person, firm, or corporation from any duty of exercising reasonable care in selecting securities for purchase or investment.

Source: SL 1972, ch 241, § 46; SDCL Supp, § 46-17A-45; SL 1993, ch 213, § 242; SL 1995, ch 167, § 188.