Prosecuting foreign online casino operators has just become more difficult due to judgements handed down by the US Supreme court. Online casino operators are frequent targets of the US law enforcement but making money laundering charges stick will not be easy.
The transportation of monies across borders by online casinos does not constitute money laundering. A deliberate attempt to conceal the source of money and/or efforts to present the money as legitimately gained, have to be proven.
As the statutes are curently written, online casinos transporting money to pay a winning gambler, employees or business expenses does not qualify as money laundering. The element of deceit must first enter and be proven before charges can be laid.
Prosecutors will face the tough task of proving the much harder case of illegal gambling. Laws on this are vague and quite contradictory even though that is the actual crime they want to prosecute. Law enforcement officials may want to eradicate online casinos but the burden of proof rests with them and it is a difficult case to prove. Should the case make it to the the Supreme Court, it could well be that it proves to be legal under current laws.