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Drugs in sport. Conceptual computer illustration of drug abuse in sport, showing athletes running around a running track on a drug capsule. Drugs may be taken to build-up muscle, increase the blood's oxygen-carrying capacity or stimulate the body. Other drugs are taken as masking agents to prevent these illegal performance-enhancing drugs from being detected during routine testing. (KEYSTONE/SCIENCE PHOTO LIBRARY/VICTOR HABBICK VISIONS)