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The reasons for the ban are mainly the health risks of performance-enhancing drugs, the equality of opportunity for athletes, and the exemplary effect of drug-free sport for the public. Anti-doping authorities state that using performance-enhancing drugs goes against the spirit of sport.
Because of the highly advantageous way performance-enhancing drugs work on the systems of its users, emphasis on privacy and stealth in implementation has been the order of the day among those who provide the raw ingredients, manufacture the drugs, distribute them, prescribe them and monitor their effects.