The Marijuana Policy Project (MPP) is the largest organization working solely on marijuana policy reform in the United States in terms of its budget, number of members, and staff.
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 – thereby prohibiting even medical use of the drug. 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 Massachusetts is legal for medical and recreational use. It also relates to the legal and cultural events surrounding the use of cannabis. A century after becoming the first U.S. state to criminalize recreational cannabis, Massachusetts voters elected to legalize it in 2016.
Oregon Ballot Measure 91 was a 2014 ballot measure in the U.S. state of Oregon. Its passage legalized the "recreational use of marijuana, based on regulation and taxation to be determined by the Oregon Liquor Control Commission".
In the U.S. state of Maine, marijuana (cannabis) is legal for recreational use. It was originally prohibited in 1913. Possession of small amounts of the drug was decriminalized in 1976 under state legislation passed the previous year. The state's first medical cannabis law was passed in 1999, allowing patients to grow their own plants. The cities of Portland and South Portland decriminalized the possession and recreational use of marijuana in 2013 and 2014, respectively.
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.
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.
Maine Question 1, formally An Act to Legalize Marijuana, is a citizen-initiated referendum question that qualified for the Maine November 8, 2016 statewide ballot. It was qualified for the ballot after a Maine Superior Court judge ordered that petitions rejected by the Maine Secretary of State be reconsidered. The proposal sought to legalize the recreational use of marijuana in Maine for those over the age of 21, and institute a 10 percent tax on its sale. As the Maine Legislature and Governor Paul LePage declined to enact the proposal as written, it appeared on the ballot along with elections for President of the United States, Maine's two U.S. House seats, the Legislature, other statewide ballot questions, and various local elections.
The Adult Use of Marijuana Act (AUMA) was a 2016 voter initiative to legalize cannabis in California. The full name is the Control, Regulate and Tax Adult Use of Marijuana Act. The initiative passed with 57% voter approval and became law on November 9, 2016, leading to recreational cannabis sales in California by January 2018.
Cannabis in Nevada became legal for recreational use on January 1, 2017, following the passage of Question 2 on the 2016 ballot. The first licensed sales of recreational cannabis began on July 1, 2017.
Cannabis in New Mexico is legal for recreational use as of June 29, 2021. A bill to legalize recreational use – House Bill 2, the Cannabis Regulation Act – was signed by Governor Michelle Lujan Grisham on April 12, 2021. The first licensed sales of recreational cannabis began on April 1, 2022.
Cannabis in New Jersey is legal for both medical use and recreational use. An amendment to the state constitution legalizing cannabis became effective on January 1, 2021, and enabling legislation and related bills were signed into law by governor Phil Murphy on February 22, 2021.
Cannabis in Maryland is legal for medical use and illegal for recreational use, but possession of 10 grams or less is decriminalized. In 2013, a state law was enacted to establish a state-regulated medical cannabis program. The program, known as the Natalie M. LaPrade Maryland Medical Cannabis Commission (MMCC) became operational on December 1, 2017. As of January 1st, 2023 thru June 30th, 2023, decriminalization will be temporarily expanded from possession of less than 1 oz to less than 1.5 oz, prior to full legalized recreational use of 1.5 oz or less on July 1st, 2023 due to the passage of the 2022 Maryland Question 4 referendum.
Cannabis in Michigan is legal for recreational use. A 2018 initiative to legalize recreational use passed with 56% of the vote. State-licensed sales of recreational cannabis began in December 2019.
The Michigan Regulation and Taxation of Marijuana 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.
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.
The Regulate Cannabis Like Alcohol initiative is a ballot initiative for legalization of cannabis in the U.S. state of Ohio. It was introduced in 2021, originally for the 2022 general ballot, then moved potentially to 2023 following a lawsuit.
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.
