The contest between athletes who use performance-enhancing drugs and the authorities trying to catch them is much like a race itself. Each time a new drug test comes out, athletes and their doctors figure out a way to outsmart it.

But a new "biological passport" that measures blood and body chemistry over time may finally be putting a dent in sports doping.

Professional cycling is the first sport to embrace the relatively new test, and it's just nabbed its biggest catch: an Italian cyclist, Franco Pellizotti, who was one of the favorites to win this year's Giro d'Italia. The Giro d-Italia, a grueling three-week event second in size and importance only to the Tour de France, kicks off on Saturday.

(Adapted from http:// news.discovery.com/tech/biological-passport-cycling-doping. html) 

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