BOB DOUGHTY:Sports dopers are always looking for new substances and technologies to help them pass drug tests. In March, a court based in Switzerland decided that an athlete may be punished for illegal doping even if she or he does not fail such a test. The Court of Arbitration for Sport is sport’s highest court. Its ruling may influence sports doping testing around the world. The ruling was the Court’s first after examining the scientific and legal strength of an athlete’s “biological passport.” Information in a biological passport can help catch athletes who use banned drugs but find ways to avoid testing positive for them. These athletes are known as sophisticated dopers.

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FAITH LAPIDUS: David Epstein writes about sports doping for Sports Illustrated magazine.

DAVID EPSTEIN: “Right now there are plenty of methods of doping that are mostly or completely un-detectable. You can dope, and stay within the limits of testing. You know there are a lot of ways to dope that are still cutting-edge compared to the anti-doping technology that we have.”

FAITH LAPIDUS: So, what is wrong with doping? That is a question many people ask -- even some health experts. These people support what has been called medically-supervised doping. They say it would reduce the dangers of doping. They say sporting events would be fairer if all the competitors were openly permitted to take part in doping. David Epstein says his readers react strongly when he writes about medically-supervised doping.