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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.
It should be pointed out that a substance does not need to be controlled for a sport to ban it if it so chooses. In fact, many drugs banned in sports are not controlled substances. For instance, beta-blockers which slow the heart rate (used for blood pressure and heart disease) are banned in archery.