Short answer
No. Marijuana is a Schedule I controlled substance under the federal Controlled Substances Act, 21 U.S.C. § 812. Carrying it from one state into another is interstate transport of a controlled substance. That holds even when both states allow adult use.
States that legalized cannabis regulate activity inside their borders. No state law authorizes a person to carry cannabis across a state line. Several states, including California, bar licensed cannabis from leaving the state at all.
What federal law covers
- Simple possession: 21 U.S.C. § 844. A first offense for a small amount carries up to 1 year in prison and a $1,000 fine.
- Possession with intent to distribute: 21 U.S.C. § 841. Penalties scale with weight and prior convictions.
- Interstate commerce: the CSA reaches transport between states, through airports, and across federal property.
Airports and air travel
Airports and aircraft sit under federal jurisdiction. TSA states its screeners do not search for marijuana, but officers who find it refer the matter to local or federal law enforcement. Checked bags, carry-on bags, and body scanners can all surface it.
Some airports post amnesty boxes so passengers can discard cannabis before security. Dropping an item in a box is not a defense for carrying it to that point.
Federal land
National parks, national forests, and other federal property prohibit possession. 36 CFR § 2.35 applies inside national parks. Rangers can cite or arrest you, and the case goes to federal court, not state court.
Road travel and checkpoints
U.S. Customs and Border Protection operates checkpoints within 100 miles of any border, including coastlines. Officers there can question travelers about citizenship and search on probable cause. A drug dog alert supplies probable cause.
State troopers can stop a vehicle for a traffic violation. Odor of marijuana has served as probable cause in many states, though some state courts have narrowed that rule.
Hemp and CBD products
The 2018 Farm Bill removed hemp with 0.3% delta-9 THC or less by dry weight from the CSA. State rules differ. Some states ban hemp-derived intoxicating products. Interstate shipment of those items remains contested in court as of 2025.
Enforcement reality
Federal prosecutors file few simple possession cases against individual travelers. That discretion is not a right. Outcomes turn on the officer, the state, the amount, and the packaging.
Unknown: no public dataset tracks how many interstate cannabis cases are filed each year.