S.D. Codified Laws § 37-24-57

A financial institution, as defined in 31 U.S.C. § 5312(a)(2), who voluntarily or mandatorily reports via a suspicious activity report, pursuant to 31 U.S.C. § 5318(g), any possible violation of law or regulation constituting exploitation, as defined in subdivision 22-46-1(5), may also report the information contained in the suspicious activity report to state or local law enforcement. A financial institution is immune from any civil or criminal liability that might otherwise result from complying with this section.