Bonds used steroids in 2003, trainer says on secret recording Slugger's lawyer sees 'another below-the-belt bash' Lance Williams and Mark Fainaru-Wada, Chronicle Staff Writers Saturday, October 16, 2004 Barry Bonds was using an "undetectable" performance-enhancing drug during the 2003 baseball season, his weight trainer claimed in a conversation that was secretly recorded last year and provided to The Chronicle. Trainer Greg Anderson, 38, who is Bonds' longtime friend and a defendant in the BALCO steroids conspiracy case, also said on the recording that he expected to receive advance warning before the San Francisco Giants superstar had to submit to a...