Laws in Thailand: How Travelers Can Stay Out of Jail

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What travelers need to know about drug laws, the legal drinking age, visa restrictions and the Thai royal family.


A gold temple in Thailand Photo © iStock/tobiasjo

Thailand has long attracted hedonistic travelers, but don’t make the mistake of thinking “anything goes” in the Land of Smiles. Behave with the same caution and respect you show back home and you’ll avoid trouble.

Respect the Thai royal family

In many Western countries, it’s normal for people to make fun of, or criticize national figureheads, even royalty. Thailand, however, has extremely strict laws called lese-majeste, under which people can receive long prison sentences for insulting its monarchy.

Like the UK, Japan, Spain, Belgium and the Netherlands, to name a few, Thailand is a constitutional monarchy. This means it has a Government, but its head of State is a royal figure. In Thailand’s case, that is King Maha Vajiralongkorn.

Lese-majeste complaints can be filed by anyone, against anyone, and are always investigated by the police.

While it is rare for tourists to face lese-majeste charges, it can happen. So do not, in any circumstances, say anything negative about Thailand’s monarchy while you’re in the country. Also, do not write anything derogatory about the Thai Royal family online. It’s better to avoid mentioning them altogether.

There will also probably be times during your trip to Thailand that you’ll need to stand to attention as a mark of respect to the nation and, by extension, to its royal family. In urban areas, at 8am and 6pm every day, you’ll hear loudspeakers playing the Thai national anthem. Follow the lead of locals, stop whatever you’re doing, and stand still and silent until the song finishes.

Another version of this occurs before movies at Thai cinemas. Just before the film begins a video is shown celebrating the Thai Royal family, during which the audience will stand quietly. Do as they do to avoid causing offense and potentially landing yourself in trouble.

Always carry your passport in Thailand

Thai authorities recommend tourists and foreign ex-pats carry their passports with them at all times while in Thailand. If you are comfortable doing that, then go ahead. Many tourists, however, are justifiably worried that constantly having their single most important document on their person greatly heightens the risk of it being lost or stolen.

I won’t advise against something that is law. Just make sure, at a minimum, you carry a clear, printed photocopy of your passport photo page, your Thai VISA page, and of your Thai entry stamp. Also, keep photos of these pages in your phone. It is very rare for tourists to be asked by Thai police to show their passports. But if this does occur, then at least producing a photocopy and phone photo of your passport will help greatly.

Avoid illegal drugs in Thailand

It can be a life-altering mistake to ignore Thailand’s stringent drug laws. You could face long imprisonment if found in possession of cocaine, heroin, ecstasy, LSD, opium, amphetamines, benzodiazepines, ketamine or magic mushrooms (among others).

And don’t be fooled by worldwide headlines about Thailand legalizing cannabis in early 2022 – smoking marijuana can still land you in a Thai jail. In 2018, Thailand became the first country in Southeast Asia to legalize medical marijuana, and then in 2022, to an extent, it removed cannabis from its list of illegal drugs. I use that qualifier because it actually only legalized cannabis that contains less than 0.2% (by weight) of THC, which is the psychoactive compound in marijuana that has an intoxicating effect.

But cannabis smoked or eaten for recreational purposes normally has a much higher THC percentage than that. Thailand, then, has essentially legalized weak forms of cannabis that won’t get you high. So if you decide to buy marijuana while on holiday in Thailand, you’d better be certain it contains only the lawful amount of THC. And how can you possibly know that? Just forget about recreational drugs while in Thailand, where there are many legal ways to find joy.

Note: In January 2024, the Thai government proposed new legislation that would outlaw cannabis except for medical and health-related purposes. Be aware that there may soon be a full ban on recreational cannabis use.

Thailand's legal drinking age is 20

In Europe, the legal drinking age ranges from as young as 16 up to 18 years old, while in Australia, New Zealand and parts of Canada it is 18. In Thailand, you have to be 20 years old to legally buy alcohol. This may surprise some readers, as many teenage tourists drink alcohol while partying in Thailand.

No matter what other tourists tell you about the leniency regarding underage tourists and alcohol, Thai law is Thai law. And Thai police have publicly stated they’re cracking down on underage drinking more than ever since the Pandemic began.

Don't overstay your visa in Thailand

Especially for backpackers slowly traveling around Asia, the desire to remain in Thailand for several months can be strong. And the same way you may hear it’s easy to get away with smoking weed, underage drinking, or not carrying any evidence of your passport, fellow travelers may convince you that overstaying your Thai visa isn’t a big deal. “You’ll just get a small fine,” they may say.

To an extent, they’re right. If you remain in Thailand beyond the date permitted on your visa you’ll be fined 500 baht (USD $15) for each day you have overstayed up to a maximum of 20,000 baht ($600). I have met travelers who preferred to pay that maximum fine rather than face the hassle of renewing their visa.

That is a big mistake for two reasons. Firstly, if you are caught by the police while wandering around Thailand overstaying your visa (as opposed to at the airport as you depart), you can potentially face more serious penalties, including a ban from re-entering Thailand for a period of time.

Secondly, if you overstay your Thai visa by between 90 days and one year, you face a one-year ban from re-entering Thailand and will find it more difficult to get Thai visas in the future. The penalties increase for overstays of more than one year (three-year ban), more than three years (five-year ban) and more than five years (10-year ban)

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  • Mark Gall said

    I find it very difficult to believe that some of these folks listing horrendous problems actually know of what actually occurred. I've been married to an educated Thai woman from Bangkok who I met in 2005 (and now in 2021 have been with her for over 15 years). I also lived in Thailand for over 4 years in many different places from the Malaysian border to Mai Sai at the northern border. Being retired and enjoying travel a lot, as well as knowing a number of foreigners and Thais there, I stayed for one month or more in about 20 different places around the country, and never, not once, felt that my safety (or my wife's) was in danger.
    Is it possible to have a problem in Thailand? Of course it is, but being retired from U.S. federal law enforcement, I know that the U.S. is not exactly a safe place.
    As for overall crime stats, the U.S. and Thailand both have problems. Gun crimes: The U.S. is has 6 times more than Thailand. Intentional homicide rate is virtually identical. Rapes: the U.S. has 4 times more than Thailand per same number of people.
    The bottom line is that if you compare statistics, I'll happily live in Thailand without worry.
    By the way, I also spent several years in 19 other less than first world countries in Central/South America and Asia if that makes any difference.

  • Quoc khanh said

    How do they check if we wear underwear or not?

  • Tide Swell said

    Just out of interest, I tried to complete that travel insurance application to see what sort of quote I would receive.

    I entered my true age, (70 yrs), and received a reply to the effect that I was not eligible for insurance being aged over 65 yrs.

    What the deuce is that all about?

  • Bob Fonow said

    When I turned 65 I got the same message from World Nomads. However, I noticed a link to Allianz Global Assistance which has a reasonable annual rate for older people.

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