Marion Jones and the BALCO scandal threatened the fair play that undergirds the Olympic movement, leading the International Olympic Committee to adopt an antidoping regime that remains the world's standard. Baseball's "juiced-ball" era made a sham of the record books and led baseball writers in January to elect no players to the Hall of Fame; in the wake of such embarrassments, baseball is taking halting steps toward expanding its antidoping regime.
"In sports where comprehensive, unannounced testing is done year round, the sport is pretty clean and much, much better than, say, in the 1990s," says Jim Stray-Gundersen, an anti-doping expert who served as a physician for the 1988 and 1992 Olympic teams, in an e-mail. "In sports where there is not a comprehensive program, doping is likely as common as ever."
That leaves the National Football League (NFL) as the leading pariah of the antidoping world, with many experts saying that its first big PED scandal is more a matter of when, not if.