There are no federal cannabis possession limits that make any amount legal. Marijuana is a Schedule I controlled substance under the Controlled Substances Act, and 21 U.S.C. § 844 makes simple possession of any quantity a federal misdemeanor. Quantity at the federal level does not create a lawful allowance. It only escalates penalties once possession crosses trafficking thresholds.
Are there federal possession limits for cannabis?
No. Federal law does not recognize a personal-use amount, a medical amount, or a state-issued card. A single gram and a full ounce carry the same federal classification as Schedule I substances, even where state law permits adult use.
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What changes with quantity is the charge and the sentence. Small amounts fall under simple possession. Larger amounts are treated as possession with intent to distribute under 21 U.S.C. § 841, regardless of what the person intended.
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How do federal quantity thresholds work?
Federal sentencing uses weight tiers rather than a legal limit. Crossing a tier raises the statutory maximum and the recommended sentence.
how much weed can you legally carry
- Simple possession (21 U.S.C. § 844): any amount; first offense up to 1 year and a minimum fine of $1,000.
- Under 50 kg of marijuana mixture: up to 5 years under § 841(b)(1)(D).
- 50 to 99 kg: up to 20 years.
- 100 to 999 kg: up to 5 years with a 5-year mandatory minimum for a prior drug felony.
- 1,000 kg or more, or 1,000 or more plants: 10-year mandatory minimum.
These tiers apply to federal cases. Federal courts use actual weight of the plant material, not the number of joints or servings.
Do state possession limits override federal law?
No. State legalization does not amend the Controlled Substances Act, and federal agents can still investigate and charge possession in states where cannabis is legal. Federal prosecutors keep broad discretion, and since 2018 there has been no nationwide enforcement guidance shielding state-legal possession.
In practice, federal charges for small personal amounts are rare outside federal property, tribal land, and interstate cases. That is an enforcement pattern, not a legal protection.
Where does federal cannabis law apply even in legal states?
Some locations are always federal. Possession on these sites can be charged no matter what the surrounding state allows.
- National parks, monuments, forests, and other federal land
- Military bases and federal buildings, including courthouses
- Airport security areas and aircraft under federal jurisdiction
- Interstate travel and shipment across state lines
Does medical cannabis change federal possession limits?
No federal medical exception exists. Since 2014, appropriations riders have blocked the Justice Department from spending funds to stop states from carrying out their own medical cannabis laws, and the Supreme Court upheld that rider in United States v. McCrorie (2020).
That protection applies to state programs, not to individuals carrying a card. It also does not cover recreational programs, and it must be renewed each federal budget cycle.
Would rescheduling cannabis to Schedule III legalize possession?
No. In 2023 the Department of Health and Human Services recommended moving marijuana to Schedule III, and the DEA opened a proposed rulemaking with administrative hearings. Even if finalized, Schedule III remains a controlled substance, so possession outside FDA-approved products would stay unlawful under federal law.
Only FDA-approved cannabis-derived drugs, such as Epidiolex and Marinol, are lawful at the federal level, and those require a prescription.
Quick answers
What is the federal limit for personal cannabis possession?
There is none. Any amount is a federal misdemeanor under 21 U.S.C. § 844.
Can I bring cannabis to a national park?
No. National park land is federal, and park regulations treat possession as a federal offense even in legal states.
Does a state medical card protect me from federal charges?
No. A state card has no effect on federal classification or federal charging decisions.