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No easy answer to question that won't be going away any time soon

Updated: July 2, 2008, 2:59 PM ET
By Jim Caple | ESPN.com

EUGENE, Ore. -- And now we come to the time in the Olympic trials when we pose the question: Just what is a performance enhancer, anyway?

Most people would suggest that steroids and human growth hormone qualify as performance enhancers, but what about less clear examples? What about swimsuits that affect drag and buoyancy so much that world records are falling like airline stock prices? What about athletic shoes that weigh so little they might as well be made of helium? Or high-tech ...

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