South Dakota’s Cannabis Legalization Battle: When Voters Say Yes and Politicians Say No

South Dakota holds a singular distinction in American cannabis politics: it is the state where the gap between voter intent and political outcome has been widest, most persistent, and most instructive about the limits of direct democracy when elected officials are determined to resist.

In November 2020, South Dakota voters approved both Amendment A — legalizing recreational cannabis — and Measure 26 — establishing a medical cannabis program — in the same election. It was the first time any state had passed both medical and recreational measures simultaneously. The margin was not close. Amendment A passed 54% to 46%. Measure 26 passed 70% to 30%.

What followed was not implementation. What followed was a case study in how political systems can absorb, deflect, and ultimately override the expressed will of their constituents on cannabis policy.

The Constitutional Challenge

Within weeks of the 2020 vote, Governor Kristi Noem — who had campaigned aggressively against both measures — arranged for a legal challenge to Amendment A. Pennington County Sheriff Kevin Thom filed suit arguing that the amendment violated South Dakota’s requirement that constitutional amendments address a single subject. The argument was that Amendment A did too many things at once — legalizing cannabis, establishing a regulatory framework, and dedicating tax revenue.

In February 2021, Circuit Court Judge Christina Klinger sided with the challenge, striking down Amendment A. The South Dakota Supreme Court upheld the ruling in November 2021 in a 4-1 decision. The recreational legalization that voters had approved was nullified.

The legal reasoning was defensible in a narrow technical sense — South Dakota does have a single-subject rule for constitutional amendments, and courts in other states have applied similar restrictions. But critics pointed out that virtually every significant ballot measure addresses multiple related aspects of a single policy question, and that the single-subject rule was being applied selectively and aggressively to invalidate a measure that the political establishment opposed.

Medical cannabis, approved through a statutory initiative rather than a constitutional amendment, survived the legal challenge and was implemented — though not without its own obstacles.

Medical Implementation: Death by a Thousand Cuts

The medical cannabis program that eventually launched in South Dakota bore only a passing resemblance to what voters had envisioned. Through the legislative process, lawmakers added restrictions that narrowed the program significantly:

Qualifying Conditions: The legislature kept the qualifying condition list restrictive, excluding conditions like anxiety and chronic pain subtypes that other states routinely include.

Possession Limits: Patient possession limits were set at three ounces — reasonable on paper but paired with purchasing limits that made it difficult for patients with high-consumption needs to maintain adequate supply.

Dispensary Caps: The number of licensed dispensaries was initially limited, creating access deserts in rural areas of an already sparsely populated state.

Residency Requirements: Strict residency verification requirements created barriers for patients who split time between states or who had recently relocated.

The program launched in mid-2022 and has grown modestly since then, but participation rates remain below projections. As of early 2026, approximately 8,500 patients are enrolled — a fraction of the estimated eligible population in a state of 900,000 residents.

The 2022 Ballot Measure: Round Two

Undeterred by the court ruling, legalization advocates returned with Measure 27 on the November 2022 ballot. This time, they drafted a statutory initiative rather than a constitutional amendment, specifically to avoid the single-subject challenge that had killed Amendment A.

Measure 27 was more modest in scope — it would have legalized possession and personal cultivation for adults 21 and older while leaving the regulatory and taxation framework to the legislature.

It failed, 47% to 53%.

The loss was a gut punch for legalization advocates, but the reasons for it were complex and instructive:

Changed Political Environment: The 2022 midterms had different turnout dynamics than the 2020 presidential election. In South Dakota, lower turnout elections skew older, more rural, and more conservative.

Opposition Spending: Governor Noem and allied organizations invested heavily in opposition messaging, framing legalization as a threat to public safety and child welfare.

Measure Design: By leaving the regulatory framework to the legislature, Measure 27 ironically created uncertainty that opponents exploited. “You’re trusting the same legislature that gutted the medical program to build a fair recreational market” was a surprisingly effective argument from both sides of the political spectrum.

Voter Fatigue: Some supporters of the 2020 measure were simply exhausted by the cycle of passing measures and having them overturned or undermined. The sense that “it doesn’t matter what we vote for” depressed turnout among natural allies.

Where Things Stand in 2026

South Dakota enters 2026 in a political stalemate on cannabis. The medical program exists but underperforms. Recreational legalization has been approved by voters and rejected by courts, then rejected by voters in a different political environment. The legislature has shown no interest in pursuing legalization independently.

Several dynamics are shaping the current landscape:

The Border Effect

South Dakota is now bordered by states with more permissive cannabis laws. Montana has a functioning adult-use market. Minnesota legalized in 2023 and launched sales in 2025. This creates a dynamic where South Dakota residents — and their consumer spending — flow across state lines to access cannabis legally.

The economic argument for legalization grows stronger with each passing year as neighboring states collect tax revenue that could be flowing into South Dakota coffers. But the political calculus in Pierre has not shifted sufficiently to overcome ideological opposition.

The Tribal Sovereignty Question

Several tribal nations within South Dakota have moved to establish their own cannabis operations under tribal sovereignty. The Flandreau Santee Sioux Tribe was actually one of the first tribal nations in the country to attempt cannabis cultivation, back in 2015 — an effort that was raided by federal authorities before it could launch.

The legal landscape for tribal cannabis has evolved significantly since then. The Oglala Sioux Tribe and other nations have explored or established cannabis programs that operate under tribal law regardless of state prohibition. These operations create a complex jurisdictional patchwork and an implicit rebuke of the state’s restrictive stance.

The 2026 Political Landscape

Cannabis advocates have not abandoned the ballot measure approach, but they are being more strategic about timing. A 2026 presidential election year would provide the higher-turnout conditions that favor legalization — the same dynamics that produced the 2020 victory.

As of this writing, at least two groups are gathering signatures for potential 2026 ballot measures, with different approaches:

One group is pursuing a constitutional amendment with careful single-subject drafting designed to survive judicial scrutiny. The other is pursuing a statutory initiative with a more complete regulatory framework than Measure 27 offered, attempting to address the “trust the legislature” concern that undermined the 2022 effort.

Whether either measure reaches the ballot — and whether South Dakota voters are willing to go through this process a third time — remains uncertain.

The National Significance

South Dakota’s cannabis saga matters beyond its borders because it illustrates a structural tension in American cannabis policy: the gap between public opinion and political action.

Nationally, cannabis legalization polls at approximately 70% support. In many states, including conservative ones, ballot measures have passed by comfortable margins. Yet legislative bodies remain reluctant to act, and in some cases — South Dakota being the most extreme example — actively resist voter-approved measures.

This pattern has parallels in other policy areas, but cannabis is notable because the federal-state tension creates unique vulnerabilities. A state legislature can plausibly argue that implementing cannabis legalization creates conflicts with federal law, even as the federal government increasingly signals non-enforcement.

The situation also highlights the limitations of the ballot initiative process. Passing a measure is only the first step. Implementation requires cooperation from the executive branch, the legislature, and the courts — all of which can slow, modify, or block a measure that they oppose. States like Arizona that have managed to build thriving cannabis markets demonstrate what is possible when the political establishment accepts voter will.

Looking Forward

The most likely path to cannabis legalization in South Dakota is not a single dramatic victory but a gradual accumulation of pressure: border state competition eroding the economic argument against legalization, the medical program slowly normalizing cannabis in the public consciousness, tribal operations demonstrating that cannabis commerce can function without catastrophe, and demographic change shifting the electorate.

For national observers, South Dakota serves as a reminder that cannabis legalization is not inevitable in any given state, regardless of public opinion polling. The political economy of prohibition — law enforcement funding, ideological commitments, institutional inertia — can sustain policies that majorities oppose for years or even decades.

But the trajectory is clear, even if the timeline is not. South Dakota will legalize cannabis. The only questions are when, through what mechanism, and how much political capital will be spent fighting a battle that the opposition has already lost in the court of public opinion. The voters made their preference clear in 2020. The political system has spent six years failing to honor it.