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Current anti-doping testing methods have their challenges, but a new approach, called longitudinal testing, represents one of the most exciting anti-doping developments that some experts have seen, write Mark Fainaru-Wada and T.J. Quinn.

Has Bud Selig done enough to fight performance-enhancing drugs in baseball, or will he be lambasted again by a congressional subcommittee on Tuesday? Some of his legacy hangs in the balance, write T.J. Quin and Mark Fainaru-Wada.