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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.
Athletic drug testing is done to detect banned substances or performance enhancing agents in competitive-level athletes. In the U.S, drug testing may occur in Olympic-level sports, National Collegiate Athletic Association sports (NCAA), and professional sports.