S.D. Codified Laws § 51A-6A-31
The director shall examine each trust company at least once every thirty-six months or more frequently if the director considers it necessary to make a full and careful examination and inquiry into the condition of the affairs of the trust company. For purposes of the examination, the director may administer oaths and examine under oath the board members, officers, employees, and agents of any trust company. The examination shall be reduced to writing by the person making it, and the person's reports shall contain a full, true, and careful statement of the condition of the trust company. The director, in lieu of making a direct examination and inquiry at the trust company office, may examine the trust company in whole or in part by examining the trust company records or documents off-site. For an examination conducted wholly or partially off-site, the director may require production of any records or documents of the trust company at the director's office. The director shall provide a copy of the written examination report to the governing board of the trust company. Neither the director nor any employee of the Division of Banking may have any ownership interest in a trust company.
The director may examine an out-of-state trust institution's trust service offices either on- or off-site to determine whether such offices are being operated in compliance with the laws of this state and in accordance with safe and sound practices.
The director may enter into cooperative, coordinating, and information-sharing agreements with any other supervisory agency or any organization affiliated with or representing one or more supervisory agencies with respect to the periodic examination or other supervision of any trust company or out-of-state trust institution, and the director may accept such agency's or organization's report of examination or investigation in lieu of conducting an examination or investigation.
SDCL 51A-6A-31