When Bridgeport, Conn., lawyer Frank J. Riccio II filed an appearance to represent Richard Breckenridge on federal weapons charges in 2004, he never thought he’d end up playing a role in the case few defense attorneys ever experience — witness for the prosecution.

Riccio’s trip to the witness box in U.S.A. v. Breckenridge late last month was to testify regarding the charge of witness tampering, which the government added to Breckenridge’s felon-in-possession indictment in April 2005.