A federal appeals judge put a prosecutor on the defensive over the Southern District U.S. Attorney’s Office approach to insider trading cases on Tuesday, questioning the message it sends Wall Street as it scores successes including 80 convictions over the last six years.

Judge Barrington Parker (See Profile), of the U.S. Court of Appeals for the Second Circuit, questioned the government’s methods as a three-judge panel heard oral arguments in the appeals of the December 2012 convictions of two former portfolio managers.