A 2006 book, Game of Shadows by San Francisco Chronicle investigative reporters Lance Williams and Mark Fainaru-Wada, chronicled alleged extensive use of performance enhancers, including several types of steroids and growth hormone by baseball superstars Barry Bonds, Gary Sheffield, and Jason Giambi. Former Senate Majority Leader George Mitchell was appointed by Selig on March 30, 2006 to investigate the use of performance-enhancing drugs in MLB. The appointment was made after several influential members of the U.S. Congress made negative comments about both the effectiveness and honesty of MLB's drug policies and Commissioner Selig.
A 2006 book Game of Shadows by San Francisco Chronicle investigative reporters Lance Williams and Mark Fainaru,-Wada, chronicled alleged extensive use of performance enhancers, including several types of steroids and growth hormone by baseball superstars Barry Bonds, Gary Sheffield, and Jason Giambi. Former Senate Majority Leader George Mitchell was appointed by Selig on March 30, 2006 to investigate the use of performance-enhancing drugs in MLB. The appointment was made after several influential members of the U.S. Congress made negative comments about both the effectiveness and honesty of MLB's drug policies and Commissioner Selig.