SDCL § 47-14A-50: Execution by agent--Authorization of agent.

Unless otherwise provided in the governing instrument, any person may sign any certificate or amendment thereof or enter into a governing instrument or amendment thereof by any agent, including any attorney-in-fact. An authorization, including a power of attorney, to sign any certificate or amendment thereof or to enter into a governing instrument or amendment thereof need not be in writing, need not be sworn to, verified, or acknowledged and need not be filed in the Office of the Secretary of State, but if in writing, shall be retained by the business trust or a trustee or other person authorized to manage the business and affairs of the business trust.