If one of the alternative acts required by an obligation is such as the law will not enforce, or becomes unlawful, or impossible of performance, the obligation is to be interpreted as though the other stood alone.
S.D. Codified Laws § 20-3-2
Unlawful or impossible alternative disregarded
Source: CivC 1877, § 816; CL 1887, § 3439; RCivC 1903, § 1132; RC 1919, § 739; SDC 1939, § 47.0116.
Official source: South Dakota Legislature. Reproduced from public-domain South Dakota statutes; confirm against the official source for the current text. Not legal advice.