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Report: Allmendinger requests "B" sample be tested

NASCAR driver A.J. Allmendinger will use his last challenge to a failed drug test that led to his temporary suspension, USA Today reported Monday.

Allmendinger asked NASCAR to test the "B" sample, hoping it will produce a negative result. If that test does come up negative for banned substances, Allmendinger will be reinstated immediately. It the test is positive, he would be suspended indefinitely.

Allmendinger could complete NASCAR's drug abuse program, which would allow him to be considered for reinstatement, although there is no assurance he would have a ride even if he is reinstated.

The "B" sample will be tested at the same Nashville laboratory that tested the "A" sample collected June 29. The samples were taken at the same time and then separated.

It could take up to five days to get the results of the "B" sample testing.

NASCAR does not reveal the name of a substance that leads to a positive test result.