But the USA Cycling test can't quantify an athlete's emotional readiness to re-enter the sport after a head injury.

WSJ: Cycling's Occupational Hazard

AV's power cycling and test systems provide EV developers and EV battery manufacturers with market-leading simulation and cycling capabilities.

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The 150 or so athletes in USA Cycling's development pool must take an online test that tracks mental and motor functions, to establish a baseline score.

WSJ: Cycling's Occupational Hazard

Additionally, Nike was recently accused of paying a former International Cycling Union president to cover up a positive drug test, which the company has denied.

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Since cycling is an Olympic sport, Usada has the power to test at all sanctioned races, even amateur events.

WSJ: Cycling's Minor Leagues of Doping

Please realize that cycling is not necessarily dirtier than other sports, they simply test more than any other sport.

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False positives on steroid tests are not unheard of, which is why cycling officials insist that any positive be confirmed by a second test by a lab approved by the World Anti-Doping Agency.

FORBES: Magazine Article

Jacobs criticized the UCI, cycling's international governing body, for revealing Landis' abnormal drug test result last week.

NPR: Landis Facing Uphill Battle on Doping Charges

The latest lawsuit filed by Armstrong, and dismissed Monday, claimed that Armstrong hasn't had "a single positive test" in the 500 to 600 drug tests he's taken in his over two decades in cycling.

CNN: August 21, 2012 -- Updated 0154 GMT (0954 HKT)