The object of a contract must be lawful when the contract is made and possible and ascertainable by the time the contract is to be performed.
S.D. Codified Laws § 53-5-2
Requisites of object
Source: CivC 1877, § 902; CL 1887, § 3526; RCivC 1903, § 1220; RC 1919, § 835; SDC 1939, § 10.0402.
Official source: South Dakota Legislature. Reproduced from public-domain South Dakota statutes; confirm against the official source for the current text. Not legal advice.