In case of incurable, chronic mania or dementia of either spouse having existed for five years or more, while under confinement by order of a court of record or of the Board of Mental Illness as provided by law, the court may in its discretion grant a divorce.
S.D. Codified Laws § 25-4-18
Chronic mental illness as discretionary ground
Source: SDC 1939, § 14.0703 (7).
Official source: South Dakota Legislature. Reproduced from public-domain South Dakota statutes; confirm against the official source for the current text. Not legal advice.