The accusation came Monday in court filings that ask U.S. District Court Judge Graham Mullen to lift the injunction he granted Mayfield so he could return to racing.
NASCAR questioned Mayfield's sworn testimony last week when he said a July 6 request for a second drug test went to voicemail and he didn't get the message until 40 minutes later. NASCAR says it has a recording of the actual phone call.
An appeals court last week issued a ruling hat put Mayfield back under suspension, but there are still unresolved legal challenges before Mullen.
In this Friday, May 8, 2009 file photo, NASCAR driver Jeremy Mayfield waits with his wife, Shana Mayfield, before qualifications at Darlington Raceway in Darlington, S.C. / photo: Associated Press
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