Cannabis Possession Limits: Federal vs State
Two sets of rules apply to the same bag of flower. Federal law sets the allowed amount at zero. Your state sets an actual number. For anyone buying at a licensed dispensary, the state number is the one that governs the counter, the car, and the hotel room. The federal number governs airports, national parks, and anything that crosses a state line.
Cannabis Possession Limits Review 2025: What You Need to Know
The Pick: Follow the State Number, Respect the Federal One
If you are 21 or older and buying in an adult-use state, buy inside that state's possession cap and stay inside the state. That one habit covers almost every legal purchase. Federal charges for a small personal amount are uncommon, but the law still applies on federal land and at checkpoints, and first-offense simple possession remains a federal misdemeanor.
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Federal Possession Rules at a Glance
- Legal amount for an individual: none. Cannabis sits in Schedule I of the Controlled Substances Act.
- First-offense simple possession: a misdemeanor with up to one year in prison and a fine, under 21 U.S.C. 844.
- A state medical card creates no federal defense. It is a state document, not a federal one.
- Federal land stays federal: national parks, federal buildings, military installations, and airport security zones.
- Carrying cannabis across a state line is a federal offense even when both states allow it.
State Possession Rules: Three Tiers
Adult-use states
States with legal recreational sales set a per-person cap for adults 21 and older. Flower caps commonly land at 1 ounce, with a few states allowing more. Concentrates and edibles are measured separately, often as grams of concentrate or milligrams of THC.
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- Colorado: 1 ounce of flower, 8 grams of concentrate, 800 mg of THC in edibles for adults 21 and older.
- Washington: 1 ounce of flower, 7 grams of concentrate, 16 ounces of solid edibles.
- California: 28.5 grams of flower and 8 grams of concentrate for adults 21 and older.
- Nevada: 1 ounce of flower or one eighth ounce of concentrate.
These numbers move with legislation. Check the state regulator's page before you assume last year's cap still holds.
Medical-only states
Medical states tie possession to a registry card and a recommendation from a qualifying provider. Caps usually run higher than adult-use caps, and some states let a caregiver hold a patient's supply. Without a valid card, the same amount can be a criminal offense.
Prohibition and low-THC states
Some states permit only CBD products under a THC ceiling. A few still criminalize any possession. A product that is legal at home can be contraband one state over.
How Limits Are Counted
- Flower is weighed as dry weight, and most states count stems.
- Concentrates convert to a gram limit lower than the flower limit.
- Edibles convert to a milligram THC limit per package.
- A home grow allowance is separate from what you may carry in public.
- Possession caps and purchase caps are not always the same number.
How to Confirm Your Limit Before You Buy
- Identify the state where you will physically stand while holding the product.
- Open that state's cannabis regulatory agency website and find the possession section.
- Match the product type to its limit: flower, concentrate, or edible.
- Confirm age and residency rules, since some states cap non-residents lower.
- Check the route for federal land or a state line, and if it crosses either, leave the product behind.
- Ask the budtender for the store's printed limit sheet and keep the receipt with the package.
At the Counter
Pop's Cannabis sells within the limits set by its own state, and staff can state the current cap for flower, concentrate, and edibles before you check out. The shopper's rule is simple: buy the state limit, keep the receipt, and keep it in state. Federal law offers no legal amount at all, so any plan that depends on carrying cannabis past a state line or onto federal property carries real legal exposure.