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| They don't have to be checked in that case.
It doesn't matter if they are FROM a Schengen country, just travelling within the Schengen zone.
It's no different than travelling from one canton to another.
And how do you know for sure that they were Japanese?
Tom | |
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Key to this is the Schengen visa which needs to be applied for if you are not from an EU country or from Iceland, Norway, Switzerland and Liechtenstein.
Once you have the Schengen visa you can enter the Schengen area and travel around Schengen.
There are complex rules and exceptions, full story is
here.