Doping is as old as organized sports. From baseball to horse racing, cycling to track and field, drugs have been used to enhance performance for 150 years. For much of that time, doping to do better was expected. It was doping to throw a game that stirred outrage. Today, though, athletes are vilified for using performance-enhancing drugs. Damned as moral deviants who shred the fair-play fabric, dopers are an affront to the athletes who...