Weed is partly legal in Argentina. Adults cannot be criminally punished for possessing a small amount of cannabis for personal use in a private setting, thanks to a 2009 Supreme Court ruling, and registered medical patients can grow their own plants and carry limited quantities. Recreational sale, cultivation outside the medical registry, public consumption, and trafficking all remain crimes, with penalties reaching fifteen years in prison.
Private Possession Is Constitutionally Protected
The protection for personal use comes from a Supreme Court decision, not a statute. In the 2009 “Fallo Arriola” ruling, the Court unanimously held it unconstitutional to criminally punish an adult for possessing a small amount of cannabis for personal consumption in private. The justices grounded the decision in Article 19 of the Argentine Constitution, which shields private conduct that does not harm third parties or offend public order.
Two limits on that protection matter in daily life. First, the ruling never set a number. There is no official gram threshold that separates “personal use” from something more serious; judges weigh quantity and circumstances case by case. A 2016 bill proposed drawing the line at five grams but was never enacted. Second, the possession offense still sits in the penal code. Police follow the statute, so arrests and detentions still happen. Arriola is best understood as a defense at trial rather than a guarantee you will be left alone on the street.
Arriola also only covers private conduct. Smoking in a park, on the sidewalk, or anywhere the use could affect others falls outside the constitutional shield. Driving under the influence of cannabis is prohibited under Argentina’s traffic safety laws.
Medical Cannabis and Legal Home Growing
Argentina legalized medical cannabis in 2017 through Law 27.350, which created the National Program for the Study and Research of the Medicinal Use of Cannabis. The original law was fairly narrow, centered on research and refractory epilepsy. Decree 883/2020 expanded it to authorize personal and network-based cultivation for registered patients, researchers, and caregivers, and established REPROCANN, the national patient registry.
REPROCANN is the gateway to legal home cultivation. To register, you need a medical prescription stating that cannabis is needed as a therapeutic or palliative treatment. Patients can grow for themselves or designate a family member, a third-party caregiver, or an authorized NGO to grow on their behalf.
Resolution 800/2021 sets the limits for registered cultivators:
- Between one and nine flowering plants
- Grown indoors only, within a maximum area of six square meters
- For transport outside the home, up to 40 grams of dried flower or up to six 30-milliliter bottles of tincture or extract
There is no specified cap on how much processed cannabis a registered patient may store at home. Outdoor cultivation is not permitted.
Registration has become harder in practice. By late 2024, the system had over 100,000 pending applications. Resolution 3132/2024 added requirements including medical specialization criteria for prescribing physicians, background checks for NGOs, and limits on how many patients a single solidarity cultivator can serve. Patients who obtained authorization earlier retain their legal status, but renewals have reportedly become more difficult, and anyone registering for the first time should expect a slower and more demanding process than existed in 2021 or 2022. Check the current status of the program through the Ministry of Health before relying on older guidance.
One point of confusion is worth clearing up. Law 27.350 references “adequate coverage and complete follow-up” for program participants, and the program is designed to supply cannabis oil at no cost to enrolled patients. It does not contain an explicit mandate requiring private health insurers or prepaid plans to cover cannabis products the way other medications are mandated. Access through the national program is the primary channel the law envisions.
What Is Still a Crime
Outside the narrow medical exception and Arriola’s protection for private personal possession, cannabis remains a controlled substance under Law 23.737. The penalties are tiered.
- Simple possession without authorization carries one to six years in prison under Article 14. When the amount is small and circumstances clearly indicate personal use, the range drops to one month to two years.
- Manufacturing, selling, transporting for sale, or distributing cannabis without authorization carries four to fifteen years in prison under Article 5. Providing cannabis to someone else for free still carries three to twelve years.
Recreational cultivation, sale, and distribution outside REPROCANN are fully criminal. Making edibles or concentrated extracts without authorization falls under the same Article 5 prohibition on producing narcotics, carrying the four-to-fifteen-year range. There is no recreational-use exception for homemade products, even in small quantities.
Traveling With Cannabis
REPROCANN-registered patients can transport their authorized cannabis within Argentina, including on domestic flights, as long as they stay within the 40-gram flower limit or six-bottle extract limit and carry their official documentation. Keep both digital and printed copies of the REPROCANN authorization alongside a matching government ID. Scrutiny has reportedly increased since late 2024.
International travel is a different story. Argentine medical authorizations have no legal effect once you cross a border. Cannabis is still controlled under international treaties, and attempting to leave or enter Argentina with cannabis products risks criminal penalties in both countries. For travelers returning to the United States, marijuana remains illegal under federal law, and U.S. Customs and Border Protection enforces controlled-substance prohibitions regardless of how the product was obtained abroad. Seizure, fines, and consequences for Trusted Traveler program status are all realistic. Leave cannabis products behind for any international trip.
What Changed Under the Current Administration
The election of President Javier Milei in late 2023 shifted how the executive branch approaches cannabis. The broader agenda of cutting agencies and spending has reached the sector directly. ARICCAME, the agency created in 2022 to regulate the hemp and medicinal cannabis industry under Law 27.669, was closed, with the administration citing administrative redundancies and excessive costs. REPROCANN processing has slowed under tighter requirements.
The underlying laws are still in force. Laws 27.350 and 27.669 remain on the books, and Arriola still stands as constitutional precedent. What has weakened is the institutional machinery for implementing them. If you are planning to rely on the medical program, treat the written rules as a starting point and confirm current administrative requirements before you apply, grow, or travel.