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Tiny lab under the skin could stop drug cheats (2:40) 

July 18 - Amid yet more claims of illegal drug-taking by high-profile athletes, scientists in Switzerland say they may have found a foolproof way to prevent the use of banned substances in sports. They say their chip implant, designed to monitor naturally-occurring substances in the blood, could also be used as a weapon against drug cheats. Jim Drury reports.

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