South Dakota Laws > Title 34 > Chapter 23A > § 34-23A-89 South Dakota Codified Laws 34-23A-89. Definition–Down syndrome Current as of: 2023 | Check for updates | Other versions For purposes of §§ 34-23A-89 to 34-23A-93, inclusive, the term, Down syndrome, is a chromosome disorder associated with an extra chromosome twenty-one, in whole or in part, or an effective trisomy for chromosome twenty-one. Source: SL 2021, ch 151, § 1. Previous sectionNext section Chapter 23A Contents