In the United States, the use and possession of cannabis is illegal under federal law for any purpose by way of the Controlled Substances Act of 1970 (CSA). Under the CSA, cannabis is classified as a Schedule I substance, determined to have a high potential for abuse and no accepted medical use. Despite this, most states have legalized either or both the medical and recreational use of cannabis.
The legal history of cannabis in the United States began with state-level prohibition in the early 20th century, with the first major federal limitations occurring in 1937. Starting with Oregon in 1973, individual states began to liberalize cannabis laws through decriminalization. In 1996, California became the first state to legalize medical cannabis, sparking a trend that spread to a majority of states by 2016. In 2012, Washington and Colorado became the first states to legalize cannabis for recreational use.
Cannabis in South Dakota is legal for medical use as of July 1, 2021, having been legalized by a ballot initiative on November 3, 2020. Prior to then, cannabis was fully illegal, with South Dakota being the only U.S. state which outlawed ingestion of controlled substances. Testing positive for cannabis can be a misdemeanor offense. South Dakota would have become the first state in US history to legalize recreational and medical cannabis simultaneously, but an amendment legalizing recreational marijuana that was approved in the same election was struck down as unconstitutional the following February. The challenge claimed the amendment violated Amendment Z, the "Single-Subject Rule". The decision was appealed to the South Dakota Supreme Court, which upheld the lower court's decision on November 24, 2021.
In the US state of Montana, cannabis has been legal for both medical and recreational use since January 1, 2021, when Initiative 190 went into effect. Prior to the November 2020 initiative, marijuana was illegal for recreational use starting in 1929. Medical cannabis was legalized by ballot initiative in 2004. The Montana Legislature passed a repeal to tighten Montana Medical Marijuana (MMJ) laws which were never approved by the governor. However, with the new provisions, providers could not service more than three patients. In November 2016 Bill I-182 was passed, revising the 2004 law and allowing providers to service more than three patients. In May 2023, numerous further bills on cannabis legalization and other related purposes passed the Montana Legislature. The Governor of Montana is yet to either sign or veto the bill.
Cannabis in Arkansas is illegal for recreational use. First-time possession of up to four ounces (110 g) is punished with a fine of up to $2,500, imprisonment of up to a year, and a mandatory six month driver's license suspension. Medical use was legalized in 2016 by way of a ballot measure to amend the state constitution.
Cannabis in North Dakota is legal for medical use but illegal for recreational use. Since 2019 however, possession under a 1/2 ounce has been decriminalized in the sense that there is no threat of jail time, though a criminal infraction fine up to $1,000 still applies. The cultivation of hemp is currently legal in North Dakota. In November 2018, the state's voters voted on recreational marijuana legalization, along with Michigan; the measure was rejected 59% to 41%. Two groups attempted to put marijuana legalization measures on the June 2020 Primary and the November 2020 elections, but were prevented from doing so by the COVID-19 pandemic.
Cannabis in Nevada became legal for recreational use on January 1, 2017, following the passage of Question 2 on the 2016 ballot with 54% of the vote. The first licensed sales of recreational cannabis began on July 1, 2017.
The Arkansas Medical Cannabis Act (AMCA) is a ballot measure that initially qualified for the ballot in Arkansas but was disqualified by the Arkansas Supreme Court 12 days before the November 8, 2016 election. A separate measure to legalize medical cannabis, the Arkansas Medical Marijuana Amendment, also qualified for the 2016 ballot and was approved by voters.
Cannabis in Arizona is legal for recreational use. A 2020 initiative to legalize recreational use passed with 60% of the vote. Possession and cultivation of recreational cannabis became legal on November 30, 2020, with the first state-licensed sales occurring on January 22, 2021.
The Michigan Regulation and Taxation of Marihuana Act, also known as Proposal 1, was an initiative that appeared on the November 2018 ballot to legalize cannabis in the U.S. state of Michigan. The initiative allows adults 21 and older to possess up to 2.5 ounces (71 g) of cannabis and to grow up to 12 plants at home. The initiative was approved with 56% of the vote.
Montana I-190, the Montana Marijuana Legalization and Tax Initiative was a cannabis legalization initiative that appeared on the November 3, 2020 Montana general election ballot. Passing with 57% approval, the initiative legalized recreational marijuana in the state effective January 1, 2021. Along with Arizona, New Jersey and South Dakota, Montana was one of four states that legalized cannabis via ballot measures in the November 2020 election.
Arizona Proposition 207 was a voter initiative that appeared on the November 3, 2020, Arizona general election ballot to legalize cannabis for recreational use. Passing with 60% of the vote, the initiative legalized the possession of up to an ounce of cannabis, licensed sales at dispensaries, and personal cultivation of up to six plants. Along with Montana, New Jersey and South Dakota, Arizona is one of four states that legalized recreational marijuana via ballot measures in 2020.
South Dakota state elections in 2020 were held on Tuesday, November 3, 2020. Its primary elections were held on June 2, 2020.
New Jersey Public Question 1, the Constitutional Amendment To Legalize Marijuana, was a measure that appeared on the November 3, 2020 New Jersey general election ballot. Passing with the largest margin of victory of any statewide cannabis legalization ballot measure in US history, Question 1 legalized the possession and recreational use of cannabis; although planned to go into effect January 1, 2021, implementation was delayed until February 22 due to a dispute between the governor and legislature over penalties for underage cannabis users. Retail sales are also allowed under the amendment.
South Dakota Constitutional Amendment A, the Marijuana Legalization Initiative, was a cannabis legalization initiative that appeared on the November 3, 2020 South Dakota general election ballot. Passing with 54% of the vote, the measure would have legalized recreational marijuana in South Dakota effective July 1, 2021. Additionally, Amendment A required the South Dakota State Legislature to establish a medical marijuana program and legal hemp sales by April 1, 2022.
2022 Missouri legalization initiative was a voter initiative on the November 2022 ballot. It was approved by voters, legalizing cannabis in the U.S. state of Missouri.
South Dakota Initiated Measure 27 was a 2022 voter initiative to legalize non-medical cannabis in the U.S. state of South Dakota. The initiative was certified by the South Dakota Secretary of State for the 2022 ballot on May 25, 2022. South Dakotans for Better Marijuana Laws (SDBML) organized the petition drive, and it was opposed by Protecting South Dakota Kids.
