Is it worth moving to a new country?

[bob2007]

"However, tax evasion is not criminal in Switzerland so the request would be denied.... but money laundering or something is and they would get full access in that case. Also, the USA can't get the records for divorce proceedings or anything civil like that. Only criminal things that are a crime in Switzerland as well. So it does offer SOME protection but isn't a ticket to avoiding taxes. "

I have also read this on other sites. My quesiton is, could the U.S. seek information on money laundering based on all your cheques from casinos? Then, when they find out it isn't, couldn't they come after you for the taxes afterwards?