All moneys belonging to the retirement system not required for the payment of current annuities, pensions, retirement allowances, other benefits, or administrative expenses in lieu thereof may be invested.

Source: SL 1925, ch 239, § 5; SL 1937, ch 177; SDC 1939, § 45.1202; SL 1945, ch 199; SL 1947, ch 204; SL 1949, ch 183, § 2; SL 1955, ch 201, § 2; SL 1967, ch 220, § 2; SL 1979, ch 37, § 4; SL 1984, ch 56, § 19.