(Providence, RI)--Testimony is being received by a grand jury convened to hear about why an audit of the Rhode Island Convention Center Authority was ordered and then canceled.The Providence Journal reports testimony began yesterday from leaders of the convention center authority, including executive director James McCarvill, who had written to the state police asking for an investigation.House Speaker Nicholas Mattiello said he ordered a performance audit of the convention center after learning of possible financial issues there from James Demers, the former convention center head of security and a friend of the Speaker's.