In sport's drug-testing arms race, the cheats are usually a step ahead
- Written by The Conversation

Yet another big name in sport has been caught up in allegations surrounding a doping scandal. Alberto Salazar, coach to several star athletes including double Olympic gold medallist Mo Farah, denies claims in a BBC documentary he broke anti-doping rules with one of his trainees, Galen Rupp. Farah is not accused of any wrongdoing.
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