[bibanez]

I don't really understand the logic here. If you've received a donation, you can't be forced to return any money, specially if you didn't know it had dubious origins

[leppr]

If the money is stolen (as is the case in the articles' story), then yes, you can be legally compelled to return the money to its original owner.

[YetAnotherNick]

Source will be appreciated. What if the money has already been spent? Do they track it all the way through or just one level?

[bibanez]

Yes that is reasonable. What I know is from an account by a relative here in Spain, and it depends on the lawyer. Of cours, infinitessimal amounts compared to the money being talked about here