CONYERS - A Rockdale County judge is frustrated with the high cost of interpeters and says he will start requiring proof that defendants cannot speak English.He says some people are pretending not to be fluent just to delay criminal proceedings.Sidney Nation, a Rockdale County Superior Court judge, says he will start having formal hearings on the need for an interpeter because his public defenders' office has exceeded its $2,500 budget for interpeters.A case in August involving Vietnamese defendants required four interpeters in the courtroom during the plea proceedings, two of which were paid for by the state. Nation ultimately determined...