add certain substances to Schedule I of the controlled substances schedule.

HB 1162 adds 59 specific substances - including synthetic opioids like "W-18" and "butonitazene," as well as compounds such as "methiopropamine" - to South Dakota's Schedule I controlled substances list. This means these substances are now classified as having no medical use and a high potential for abuse under state law. The bill directly affects anyone in South Dakota who possesses, distributes, or uses these listed substances, making such actions illegal without specific exemptions. The key mechanism is the explicit inclusion of these chemical compounds (including isomers and salts) into Schedule I, closing potential legal gaps for enforcement.