S.D. Codified Laws § 56-1-19

Current with legislation signed by the governor on or before 3/6/2024
Section 56-1-19 - Liability of guarantor-Contract of principal unlawful-Personal disability of principal

A guarantor is not liable if the contract of the principal is unlawful, but he is liable notwithstanding any mere personal disability of the principal, though the disability be such as to make the contract void against the principal.

SDCL 56-1-19

SDC 1939, § 26.0113.