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 witnessed the driver using methamphetamine at least 30 times over seven years.

Mayfield was suspended May 9 for failing a random drug test conducted eight days earlier. He sued, and U.S. District Court Judge Graham Mullen issued an injunction July 1 that allowed Mayfield to return to competition. However, Mullen gave NASCAR the right to test Mayfield at any time. NASCAR did that July 6 at Mayfield’s home.

“I don’t trust anything NASCAR does, anything Dr. David Black does, never have, never will,” Mayfield told The Associated Press in a phone interview. Black is the administrator for NASCAR’s drug-testing program.

More damaging is an affidavit from Lisa Mayfield, who said she first saw the driver use meth in 1998 at a race shop in Mooresville, N.C. She said Mayfield cooked his own drugs until the ingredient pseudoephedrine was taken off the shelves.

She said her stepson then began to purchase meth from others.

“And they picked the wrong woman to use against me because that (expletive) is trash and has got nothing on me but lies,” Mayfield said.