NASCAR said Jeremy Mayfield once again tested positive for methamphetamine and asked the federal judge who lifted the driver’s drug suspension to reinstate the ban.

The positive result from a July 6 random test was included in a U.S. District Court filing Wednesday that included an affidavit from Mayfield’s stepmother, who claimed she personally witnessed the driver using methamphetamine at least 30 times over seven years.

Mayfield once again denied ever using the illegal drug.

“I don’t trust anything NASCAR does, anything (program administrator) Dr. David B...

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