One cannabis mistake at airport could bring 10 years in prison and $15,000 fine

Before heading overseas,American travelersare warned to double-check their bags for one item that could lead to hefty fines or even prison time.

U.S.officials are reminding travelers that bringing cannabis products across international borders remains illegal in many countries — following a new customs policy in Thailand that significantly increases penalties for violators.

In June 2026, Thailand introduced tougher penalties for travelers caughtbringing cannabisacross its borders.Violators can face up to 10 years in prison, a fine of up to 500,000 Thai baht (about $15,000), or both, according to the U.S.Embassy and Consulate in Thailand.

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Although Thailand decriminalized cannabis possession in 2022, importing or exporting cannabis without the proper permissions remains illegal, the warning said.

Officials are warning Americans to check their luggage for cannabis before traveling abroad, reminding them that carrying it across international borders remains illegal in many countries.(iStock)

Jeffrey Hoffman, a New York-based cannabis attorney, said travelers should never assume that laws at home apply once they cross an international border.

“While we are seeing cannabis laws relaxed incountries like Canadaand in various states in the U.S., cannabis is still generally illegal across the overwhelming majority of the planet,�“When you travel to a different jurisdiction, you become subject to its laws.”

Hoffman, a legalization activist, pointed to the high-profile case ofWNBA starBrittney Griner, who was imprisoned in Russia after authorities found cannabis oil in her luggage, as a reminder that some countries strictly enforce drug laws.

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“There is no safe harbor when traveling internationally,” he said.“Even a mistake is no excuse.”

Travelers should never assume that laws at home apply once they cross an international border, experts say.(iStock)

Travel expert and former flight attendant Bobby Laurie, based in the D.C.area, said many travelers mistakenly assume that if something is legal at home, it’s automatically legal everywhere they go.

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“Even if you’re carrying a cannabis product for personal use or have a medical prescription, that doesn’t guarantee it [will] be allowed at your destination,�“Some countrieshave extremely strict drug laws, and the penalties can be severe.”

“Even if you’re carrying a cannabis product for personal use or have a medical prescription, that doesn’t guarantee it [will] be allowed at your destination,” said one expert. (iStock)

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Laurie recommended checking local laws before every trip, plus emptying backpacks, purses and carry-ons of forgotten items.He said people should never assume customs officials will overlook a mistake.

Some countries have laws governing everyday items that many travelers would never expect, Laurie noted — pointing to Singapore’s restrictions on chewing gum as a reminder to research destination-specific rules before packing.

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“This is one of those things you wouldn’t know unless you researched it, and how many of us walk around with that in our bags?” he said.

com/category/health/healthy-living/medications" target="_blank" rel="noopener">medical marijuanaon domestic flights.

Experts recommend checking local laws before every trip, emptying backpacks, purses and carry-ons of forgotten items, and never assuming customs officials will overlook a mistake.(iStock)

While the agency permits certain medical cannabis products under limited circumstances, experts emphasized that international travel is a different matter.

Crossing international borders with cannabis remains subject to the laws of the destination country, regardless of whether marijuana is legal where a traveler lives.

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The TSA also notes that while its officers are focused on security screening, they may refer suspected violations of law to local law enforcement.