CBS has prevented Dan Rather and his attorneys from speaking to an expert that the network hired to determine the authenticity of the documents used by Rather on his controversial 60 Minutes II report on President Bush's service in the National Guard, the New York Times reported today (Thursday). The Times reported that the network had hired former FBI agent Erik T. Rigler to investigate the documents after the program aired but instead curtailed his investigation and has never made his findings public. Rather's attorney, Martin Gold, told the the Times that he had initially been told by Rigler that he would be willing to discuss the investigation but that he would have to receive permission first from CBS. After that initial telephone conversation, however, Rigler reportedly refused to talk to Gold. "CBS shut me down," Gold told the newspaper. As part of Rather's lawsuit, however, Gold said that he intends to take Rigler's testimony during a deposition and subpoena his records.