all of the major offshore jurisdictions have appropriate procedures for law enforcement agencies to obtain information regarding suspicious bank accounts, as noted in FATF ratings.
Most jurisdictions also have remedies which private citizens can avail themselves of, such as Anton Piller orders, if they can satisfy the court in that jurisdiction that a bank account has been used as part of a legal wrong.
http://en.wikipedia.org/wiki/Offshore_financial_centre
The FATF is an inter-governmental policy-making body whose purpose is to establish international standards, and develop and promote policies, both at national and international levels, to combat money laundering (ML) and terrorist financing (TF).
http://www.fatf-gafi.org/pages/0,3417,en_32250379_32236836_1_1_1_1_1,00.html
About those offshore accounts….here is a firm that might be able to find “stuff.”
http://www.applebyglobal.com/