"A CIA agent, identified by his alias "Tom Langston," was allowed to testify in light disguise -- a wig, a beard and glasses. Langston testified about serving in Kandahar, Afghanistan, and receiving the truckload of documents from the Afghan man. The man told him that he had picked up the documents from an office that had been used by Arabs, Langston testified. But where exactly did the Afghan man find them? Why did he bring them to the U.S. side? Langston was not allowed to disclose the contact's tribal affiliation, let alone his name."