Suspended driver A.J. Allmendinger said Wednesday that he will participate in NASCAR's substance-abuse recovery program, a sign that he wants to get back to racing as soon as possible and avoid a fight over the accuracy of his failed drug test.
Allmendinger's business manager, Tara Ragan, confirmed multiple media reports Wednesday that an amphetamine triggered the positive test. Ragan said Allmendinger was waiting for additional data from the laboratory that might help identify the source of the amphetamine.
''What is it, exactly? That, we still don't know,'' Ragan said.
Allmendinger previously had said he tested positive for a stimulant he had not identified, insisting he did not knowingly ingest a banned substance.
Penske Racing president Tim Cindric said the team has no reason to doubt Allmendinger's assertion that he didn't know why he failed the test. It isn't clear whether that will be enough to save his job. In an interview with The Associated Press, Cindric said team officials plan to meet next week to discuss Allmendinger's future.
''Certainly, we have to try to understand how this all plays out and how it affects not only his future, but how it affects a lot of the various programs that we have going,'' Cindric said. ''And it has a knockdown effect in a lot of different ways that we're going to take some time to analyze, and not really have a conclusion to that here in the next few days.''
NASCAR suspended Allmendinger indefinitely after a test of his backup urine sample conducted Tuesday confirmed an initial positive test in late June. NASCAR officials did not identify the substance Allmendinger tested positive for.
Allmendinger has hired an independent laboratory to help him determine how he might have tested positive. Cindric said team officials ''don't have any reason not to believe'' his explanation that he doesn't know what triggered the positive test.