Here’s the thing nobody tells you before your first international trip: the moment you land in another country, American law stops protecting you. Completely. It doesn’t matter what’s legal in your state. It doesn’t matter what your doctor prescribed. The country you’re visiting makes the rules, and if you break them, you’re dealing with their courts, their jails, and their consequences.
Cannabis is probably the most obvious example right now. More U.S. states keep legalizing it, so it’s easy to forget it’s still a federal crime here — and outright illegal in most of the world. CBD products are the same way. Even though CBD isn’t psychoactive, it’s still controlled in some countries. And here’s the part that trips people up: even if CBD itself is technically allowed somewhere, a CBD product that also contains THC can still be illegal, and a lot of gummies and tinctures do contain trace amounts of THC. You might not even know it.
Medications are a whole other minefield. Japan is a well-known example. Common U.S. medications — including ones for pain, depression, ADHD, and even some allergy and decongestant meds — are banned in Japan. Having a valid U.S. prescription does not protect you. At all. Some substances are allowed only in limited quantities, or only if you got advance permission from the Japanese government before you arrived. Most people don’t know to ask.
And Japan isn’t alone. Plenty of countries have strict rules around things Americans consider totally routine. Certain sleep aids. Some antihistamines. Stimulants used for ADHD. What feels like a boring Tuesday prescription at home can be a serious criminal matter somewhere else.
So what do you actually do? Before any international trip, look up the specific rules for every country you’re visiting — not just for cannabis, but for every medication or supplement you’re bringing. The CDC and U.S. Customs and Border Protection both recommend traveling only with medications prescribed to you, legally obtained in the U.S., and kept in their original labeled packaging. But even that isn’t a guarantee if the substance itself is prohibited where you’re going.
The responsibility is yours. Not your doctor’s, not the airline’s. Yours. And while the U.S. Embassy can provide limited help — like giving you a list of local attorneys or checking on your welfare — they cannot get you released from foreign jail because you had gummies in your carry-on. Foreign courts operate under foreign law, full stop.