| 21. | _The testing technology has become extremely sophisticated and can catch more players who use masking agents.
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| 22. | Masking agents also are uncovered and explored.
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| 23. | He also criticized four Chinese swimmers who tested positive to a banned masking agent during the competition.
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| 24. | Diuretics are banned because they can be used as masking agents for other drugs, including anabolic steroids.
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| 25. | The substance was probenecid, a medicine for the kidney and also a masking agent for anabolic steroids.
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| 26. | More than 350 athletes have or will be tested for banned performance-enhancers, including steroids and masking agents.
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| 27. | Much of sport remained a competition among chemists, with hot drugs and masking agents lurking in many athletes'systems.
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| 28. | His career suffered a major setback in 2002 when he tested positive for the banned masking agent probenecid.
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| 29. | The IOC lists bromantan as both a stimulant and a masking agent, while clenbuterol is a steroid-related drug.
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| 30. | -- Diuretics and other masking agents
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