UFC featherweight Charles Rosa knew his first octagon opponent, Dennis Siver, had tested positive for banned substances in a previous fight, so he couldn’t be certain any foul play took place when they traded punches. But even in his own gym, Rosa can sense it when a training partner is cheating. “There’s guys I go with, and it’s a disadvantage for me,” he told MMAjunkie Radio. “I’m training with guys, and they’re strong and they’re big
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UFC Fight Night 81′s Charles Rosa gives take on performance-enhancing drugs – MMA Junkie