"'Game of Shadows' grew out of that groundbreaking reporting and is based on interviews with more than 200 people and hundreds of pages of documents, including the secret grand jury testimony of Mr. Bonds, Jason Giambi, Gary Sheffield and the track star Tim Montgomery; confidential memorandums detailing federal agents' interviews with some of the principal players in the case; and unredacted versions of affidavits filed by the Balco investigators."

http://www.nytimes.com/2006/03/23/books/23kaku.html?n=Top%2FFeatures%2FBooks%2FBook%20Reviews&_r=0