Mayfield allowed to drive after positive drug result

A day after learning Jeremy Mayfield failed a drug test for something other than a performance-enhancer, NASCAR allowed him to drive a race car at Darlington Raceway at speeds up to 173 mph. A person familiar with the test results told The Associated Press on Thursday that Mayfield's positive test was not for a performance-enhancing drug. The person spoke on condition of anonymity because NASCAR won't reveal what banned substance was found in the random test, which ultimately resulted in Mayfield's indefinite suspension. Because Mayfield challenged the initial positive finding, as allowed under NASCAR's drug policy, the series did not take disciplinary action until his backup "B" sample also tested positive. That's why Mayfield wasn't barred from participating in two practice sessions and a qualifying session May 8 at Darlington. More at ESPN.com/AP