Rotterdam confiscates expensive clothes from youth without cash

[Tiberius]

It might be cause for suspicion, perhaps further investigation. 

However in the US, I think that the innocent until proven guilty is a good policy, and this seems to be the other way around.

This kind of thing happens in the US too. Its called civil asset forfeiture and it allows police to confiscate property if they believe it was acquired by illegal means. They don't have to prove anything and the owners often have to go to court to prove their innocence in order to get their property back.