Hector Lombard In theory, or maybe in a completely different sport, the U.S. Anti-Doping Agency’s “prohibited association” rule makes a lot of sense. It’s not hard to understand the thinking behind it. If a pro athlete is using performance-enhancing drugs, chances are he’s not getting them by going out alone to score at a Gold’s Gym across town late at night
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Why USADA’s ‘prohibited association’ rule could be a square peg in a round hole – MMA Junkie