A federal appeals panel has upheld the conviction of former Orange County, Calif., Sheriff Mike Carona, after finding that federal prosecutors did not commit misconduct by having an informant wear a wire to obtain incriminating audiotapes as evidence.

A panel of the 9th U.S. Circuit Court of Appeals unanimously found that prosecutors had not violated California Rule of Professional Conduct 2-100 when they used a cooperating witness to contact Carona while he was being represented by an attorney, according to the Jan. 6 ruling.