Wait... you have a choice
What's in that bag?
There are clear rules at the airport. Also to protect you against subversive crime.
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When something seems suspicious, it often is.
If you don't trust something, it's best to always report it. For example, by talking to your manager about it. You can also report anonymously, for example to the Marechaussee or M. Want to know more? Check out the page report.