S.D. Codified Laws § 22-5-7
Morbid propensity to commit crime
A morbid propensity to commit prohibited acts existing in the mind of a person who is not shown to have been incapable of knowing the wrongfulness of such acts forms no defense to a prosecution therefor.
Source: SDC 1939, § 13.0505; repealed SL 1976, ch 158, § 5-2 ; re - enacted SL 1977, ch 189, § 15.