Japan is very safe but has strict drug laws and some surprising medication restrictions that catch tourists off-guard.
Many over-the-counter cold/allergy medications sold in the US, UK, and Australia contain pseudoephedrine or other stimulants classified as controlled substances in Japan (Vicks inhalers, certain Sudafed products, NyQuil). Bring only 1-month supply of any medication. Get a "Yakkan Shoumei" import certificate from the Japanese Embassy before travel for any controlled substance. Adderall and Ritalin are completely banned in Japan -- no exceptions.
Cannabis is completely illegal in Japan regardless of medical status in your home country. CBD oil with any THC content is prohibited. Possession: up to 5 years. Even entering Japan with cannabis in your system (if tested) has resulted in arrests. Japan enforces this against foreigners.
Carrying any knife with a blade over 6cm in public requires justification. Switchblades and butterfly knives are banned regardless of size. Pocket knives for camping/hiking: keep in luggage, not on your person.
Not illegal, but almost all onsen (hot springs) and many public baths refuse entry to visibly tattooed guests. This is a cultural/business policy, not law. Some onsen have private rooms for tattooed guests. Research before booking.
| Drug possession (cannabis) | Up to 5 years imprisonment |
| Stimulant drug import (cold medicine) | Up to 3 years imprisonment |
| Overstaying visa | Up to 3 years imprisonment + deportation |
| Working on tourist visa | Deportation + ban |
| Drunk and disorderly | Up to 30 days detention |
The medication issue catches many tourists. Before traveling to Japan, photograph every medication you're bringing and check the NHK/Japanese Embassy list of controlled substances. If in doubt, contact the Japanese Embassy in your country 3+ weeks before travel to arrange import certificates.
This is general travel information, not legal advice. Laws change -- verify with your government's official travel advisory and local legal counsel before travel. US: travel.state.gov · UK: gov.uk/foreign-travel-advice
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