S.D. Codified Laws § 12-27-47
Any person may file with the secretary of state a sworn affidavit alleging a violation of the campaign finance requirements under this chapter. A sworn affidavit alleging any misconduct, breach of statutory duty, or malfeasance shall be signed and sworn to by the affiant, fully state any fact on which the affiant relied and identify any source of factual information. If the sworn affidavit has sufficiently substantiated facts that lead the secretary of state to believe there is probable cause that a requirement under this chapter has been violated, the secretary of state may commence the contested case procedure pursuant to chapter 1-26 to remedy the violation or impose a civil penalty. The secretary of state may refer the complaint to the Division of Criminal Investigation for an investigation pursuant to chapter 23-3 and shall notify the subject of the affidavit of the referral by certified mail.
SDCL 12-27-47