Since 1992 his practice has been devoted principally to anti-fraud (qui tam) litigation under the federal False Claims Act and the similar qui tam statutes of Texas and other states. He is nationally recognized as a leading practitioner in that field and serves as a director of Taxpayers Against Fraud Education Fund, a Section 501(c)3 tax-exempt corporation dedicated to combating fraud against the government through the promotion and use of the qui tam provisions of the False Claims Act. In that capacity he has testified before state and federal legislative committees concerning administration and oversight of the False Claims Act and related state statutes. In 2013, the San Antonio Bar Association awarded him its Lifetime Achievement Award, the Joe Frazier Brown, Jr. Award of Excellence.
He is also an author. His non-fiction book, The Fall of the Duke of Duval, chronicling his investigation and prosecution of the late South Texas political boss, George Parr, has been a regional best-seller. Articles in legal journals have explained the False Claims Act and the Texas Medicaid fraud statute.