According to the book, Bonds was inspired to use steroids after watching McGwire's 1998 home run record chase with Sammy Sosa. He began working with Greg Anderson, who would later be hired by the Giants. Anderson reportedly received the substances at issue from BALCO. He also kept meticulous records of Bonds' program; the authors report that Anderson's records indicate that Bonds took up to 20 pills a day and learned to inject himself. The book also claimed that the Giants chose not to confront Bonds about his change in physical appearance, fearing that they would alienate their star slugger, or worse from the team's standpoint, create a drug scandal immediately before the opening of their new stadium.