In South Dakota 2026, adults may legally possess only low‑THC products—specifically, edibles containing no more than 2 mg of Δ⁹‑tetrahydrocannabinol (THC) per serving. The state has not approved recreational cannabis; the limited allowance applies solely to medical‑grade products authorized under the Low‑THC Medical Cannabis Act (S.D. Codified Laws § 26‑30A‑1, 2025). Anything above that threshold is considered illegal and subject to criminal penalties.
Legal THC Limits in 2026
South Dakota’s 2025 amendment caps THC at 2 mg per serving for any edible, tincture, or vaporizer cartridge sold through state‑licensed dispensaries. Whole‑plant flower may not be possessed or consumed by non‑patients. The law also limits total daily possession for qualified patients to 30 mg of THC, spread across no more than three separate doses (S.D. Dept. of Health, 2025). These strict limits differentiate the state from most neighboring jurisdictions that allow up to 10 mg per serving.
Medical vs. Recreational Distinction
Only patients with a certified qualifying condition can obtain a Low‑THC medical card. The card permits purchase of products that meet the 2 mg per serving rule, plus a maximum of 30 mg per day. Recreational possession of any cannabis containing more than 0.3 % Δ⁹‑THC by dry weight remains a misdemeanor, punishable by up to 180 days in jail and a $1,500 fine (S.D. Criminal Code § 22‑19‑34). This dual‑track approach reflects the state’s cautious stance after the 2020 ballot initiative that narrowly failed to legalize full‑scale recreational use.
Enforcement and Penalties
Law enforcement agencies use field‑testing kits to measure THC concentration in seized products. Possession of non‑medical cannabis exceeding the 2 mg limit triggers a Tier 2 misdemeanor, while distribution of high‑THC products can rise to a felony with up to five years imprisonment (S.D. Attorney General’s Office, 2026). Medical patients found with excess THC risk suspension or revocation of their cards, though the department offers a grace‑period for inadvertent over‑use.
Future Outlook
Legislators continue to debate a “full‑spectrum” amendment that would raise the per‑serving limit to 5 mg and permit flower for adult use. Polling in early 2026 shows 48 % of voters support broader legalization, up from 38 % in 2023 (South Dakota Policy Institute, 2026). Until a new ballot measure passes, the 2‑mg ceiling remains the law of the land.
Frequently Asked Questions
What is the legal THC amount per serving in South Dakota?
Adults may possess edibles or vape cartridges containing no more than 2 mg of THC per individual serving. Anything higher is illegal for non‑patients.
Can a non‑patient legally possess any THC in South Dakota?
No. Only qualified medical patients may possess THC‑containing products, and even they are limited to 30 mg total per day.
Are there any THC limits for smoked or vaporized flower?
South Dakota does not allow possession or consumption of cannabis flower for anyone, regardless of THC concentration, unless it is part of a licensed medical preparation that meets the 2‑mg per serving rule.
What penalties apply for exceeding the THC limit?
Exceeding the limit without a medical card results in a Tier 2 misdemeanor (up to 180 days jail, $1,500 fine). For medical cardholders, over‑use can lead to card suspension and possible misdemeanor charges.
Is there any pending legislation to change the THC limits?
A bill introduced in the 2026 legislative session proposes raising the per‑serving limit to 5 mg and allowing limited flower possession for adults, but it has not yet passed either chamber.