Perez, Dunn to testify in assistant police chief trial FacebookTwitterEmail The appointment of Acting Police Chief Rebeca Garcia is being challenged in court.Ned Gerard / Hearst Connecticut Media BRIDGEPORT — Former Police Chief Armando “AJ” Perez and former personnel director David Dunn are heading for federal prison for cheating on the police chief’s exam but first they may have to make a stop in state court. Both men are to be the star witnesses in a civil trial beginning Thursday challenging the selection of Rebeca Garcia as the Police Department’s assistant chief. Garcia was made acting police chief following Perez’s arrest.