I don't see how this would catch him doing what he is accused of. His name would not appear on the campaign filings. However, he could easily get caught by the NSA, who keeps track of all payments through banks. Starting with the checks to conservative candidates, then looking back for anyone who paid those people, and finding one person who paid several, is trivial for what the NSA has built.
He probably showed up on the other end of some transactions that a probe of someone else turned up.
Why do you think that in the same week as this arrest, and also in New York of all places, James O'Keefe announced that he is being investigated by New York's Dept. of Labor, and they are demanding 3 years of his financial records?
I say that the NY Dept. of Labor doesn't reallyy care about O'Keefe's finances; they only want to know who he's doing business with, so they can persecute those people too. People like D'Souza.
Something ugly is going on in New York these days.
-PJ