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The problem of doping.

Doping has long been a matter of private concern for sports insiders. Since 1988, however, when Ben Johnson was stripped of his gold medal at the Seoul Olympics after he tested positive for the steroid stanozolol, doping increasingly has become a matter of public concern. Johnson’s claim that he took drugs to level the playing field—suggesting that most if not all of his elite competitors were also using drugs—coupled with data showing that teenagers (primarily