Assistant U.S. Attorney Daniel Butler

FILE - In this Dec. 8, 2010 file photo, prosecutor Daniel Butler leaves court in Washington. (AP Photo/Charles Dharapak, File)

April 16, 2012 5:23:09 PM PDT
He specializes in fraud and public corruption cases and successfully prosecuted two racketeering trials, one involving 10 defendants who robbed six banks with machine guns.

The other was the case of "D.C. madam" Deborah Jeane Palfrey, who ran an escort service that catered to high profile clients including Sen. David Vitter, R-La.

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