Neteller has alrerady confirmed that they are cooperating fully to FBI.
As far as checks - the average US bank processes probably over 10,000 financial transactions an hour, and there are 100s of average US banks in the States, plus small banks, large banks...And there are probably 10,000s banks all over the world...So that database is quite bigger, and if a casino changes bank accounts every 1-2 months - there will not be enough time for the US banks - by the time they catch up on one account - there is already another one which replaced it.
If the checks are issued in Euro or Pound Sterling - it gets even harder.
Not to mention the man hours it would take for each bank to start analyzing checks and transfers to see if they are gambling related or not. They'll probably have to hire 10 people to work around the clock just to scratch the surface.
FBI is just using scare tactics, which are working. Maybe we'll see a few more arrests just so they would make it clear, but that should be it
