S.D. Codified Laws § 27A-13-18.2
If the administrator of the Human Services Center has treated a patient determined by the committing board of mental illness to be a proper charge against the state at large because the patient is not a resident of the state and the attorney general has appeared before the committing board to contest its determination of residence in the manner provided in this title, the attorney general may appeal the committing board's determination to the circuit court by serving a notice of appeal upon one of the members of the board of county commissioners of any county adversely interested and by filing such notice with the clerk of courts within thirty days from the date of the finding of residence by the committing board of mental illness. Upon such filing, the circuit court shall conduct a trial de novo and determine, by a preponderance of evidence, the residence of such patient and determine whether he is a proper charge against a county or the state at large. Such determination is conclusive unless an appeal is taken therefrom in the manner provided by law for appeals in civil actions.
SDCL 27A-13-18.2