The Short Answer
Under federal law, the amount of marijuana you can fly with is zero. Flights operate under federal jurisdiction, and cannabis is still a Schedule I controlled substance nationwide. Nothing about a state legalization law changes that once you pass through a security checkpoint.
Airport Security and Marijuana: What to Know Before You Fly
What happens in practice is different from what the law says. TSA does not screen passengers for drugs. If cannabis turns up during screening, officers hand the matter to local police at that airport. In a legal state, those officers often apply the state possession limit and let an adult 21 or older continue. In a state where cannabis is still prohibited, the same item can end in a citation, a confiscation, or an arrest.
What TSA Actually Does
TSA's mission is aviation security, not narcotics enforcement. The agency has stated publicly that its officers do not search for marijuana or other drugs. When a prohibited item appears during a bag check, the standard move is a referral to law enforcement with jurisdiction over the airport.
That referral is the entire decision point. TSA does not weigh your medical card, your home state's law, or your receipt from a dispensary. The officer standing next to the checkpoint does.
can you fly with cannabis tsa rules
Limits by Type of Flight
Flight within a single legal state
The strict legal answer is still zero, because the aircraft and the airspace are federally regulated. Some airports in legal states have published policies stating they will not pursue passengers carrying within the state limit. Others stay quiet and leave it to the officer on duty. If you carry anything, staying under the state possession limit is the line that matters most.
Flight between two states
This is where things get serious. Moving cannabis from one state to another violates federal law even when both states allow adult use, because the product crosses state lines. It can also violate the destination state's import rules. A nonstop flight is still interstate transportation.
International flights
Never. Customs and Border Protection enforces federal law at ports of entry with no medical or adult-use exception. A state card carries no weight at a border inspection, and penalties for importation are far heavier than a simple possession charge.
Typical State Possession Limits for Adults 21 and Older
- Alaska: 1 ounce
- California: 1 ounce (28.5 grams)
- Colorado: 1 ounce
- Illinois: 30 grams
- Massachusetts: 1 ounce
- Nevada: 1 ounce
- New York: 3 ounces of flower
- Washington: 1 ounce
These are general on-the-ground possession limits, not airport allowances. Limits change with legislation, so confirm the current number for your state before you travel.
How to Lower Your Risk
- Verify the possession limit in the state where your departure airport sits.
- Read your full itinerary, including every connection, and confirm no segment lands in a state with different rules.
- Keep any amount at or below the state limit, and keep it sealed in its original packaging with a label.
- Pack it in your carry-on rather than a checked bag, since a checked bag is screened out of your sight and any issue is handled when you land.
- Leave your medical card accessible if you hold one, though expect it to carry no federal weight.
- Skip it entirely for international trips, including flights that only touch down in another country for a connection.
What About CBD and Hemp?
Hemp-derived products with a THC concentration at or below 0.3 percent are legal under federal law, and TSA permits them in carry-on and checked bags. Anything above that threshold is treated as marijuana under federal rules. Vape cartridges and edibles with unclear labeling are the most common place travelers get tripped up, since a lab test, not the package design, sets the category.
Consequences If It Is Found
Outcomes range from a shrug to a felony. Realistic possibilities include a bag search, a missed flight, confiscation, a state citation, an arrest, or a referral for federal charges. Possession with intent to distribute across state lines is a federal offense, and quantity is a major factor in how prosecutors treat a case.
If an officer questions you, the smart move is to stay polite, answer factually, and ask for a lawyer before answering anything about ownership or intent. Do not volunteer where you bought it or where you are taking it.
Bottom Line
The federal number is zero and it does not move. The state number is whatever your airport's jurisdiction allows for possession on the ground, and it only matters if local police get involved. If your flight leaves your state in any way, treat the answer as zero and leave it at home.