Carrying marijuana across borders is complicated because rules change by jurisdiction, between neighboring regions. To travel without incident, you must research thoroughly. Begin with learning the legal status where you’re departing, where you’re headed, and each state or country on your route. Just since cannabis is allowed in your region, that doesn’t guarantee legal in other jurisdictions.

For instance, across the U.S., cannabis is permitted in certain jurisdictions, is still prohibited under federal law. Therefore, it’s illegal to carry it across state lines, even if you’re traveling between two states where it’s permitted. All airports fall under federal jurisdiction, so bringing weed into an airport terminal, even with a prescription, may lead to arrest.

Venturing overseas, the penalties are harsher. Virtually every nation prohibits it, and penalties can include heavy fines, imprisonment, or deportation. Never assume that it decriminalizes minor offenses, it’s safe to bring cannabis in. Confirm directly on the national customs portal of your destination for the up-to-date information. Don’t risk deception on official documents—lying about cannabis can lead to worse consequences than being honest.

If you need cannabis for medical reasons, bring your medical documentation, and ensure it’s translated into the official language if you’re traveling internationally. Some countries allow medical cannabis with official certification, but this is rare. Even if approved, you may need advance registrations or to register in advance. Don’t assume a note will protect you to avoid legal consequences in a place where Carte mondiale de la légalisation du cannabis is illegal.

Think beyond bringing your own supply. Leave your supply at home, look into legal options at your destination. Some places have licensed dispensaries that serve residents and visitors. Research local regulations ahead of time and arrange to buy on-site if allowed. It minimizes danger of arrest or fines and keeps you away from black market risks.

On road trips, place it out of easy reach, especially if you’re within a legal zone but heading into a prohibition area. Avoid driving while high, even in legal states, as driving while intoxicated is universally banned. Do not store marijuana in checked or carry-on bags when flying. Even if your entire trip is in a legal region, air travel is federally controlled, and you may be flagged by security.

Be mindful of social norms. Even in states with relaxed laws, some communities may view it negatively. Don’t consume openly, and be discreet. Your goal is to travel safely and legally—not draw attention. When in doubt, leave it at home. Many alternatives exist to unwind without risking a criminal record.