S.D. Codified Laws § 55-3-30
Provisions not exclusive
The provisions of §§ 55-3-23 to 55-3-29 , inclusive, shall not be construed as exclusive methods of modifying or terminating irrevocable trusts.
Source: SL 1998, ch 282, § 8.
S.D. Codified Laws § 55-3-30