CHARLOTTE, N.C. (AP) — NASCAR filed court documents Monday night that show an independent laboratory found an illegal substance in the urine sample that led to Jeremy Mayfield’s suspension for a failed drug test.

The documents, part of NASCAR’s response to Mayfield’s lawsuit to have his indefinite suspension lifted, show that Medtox Laboratories in Minnesota tested both his “A” and backup “B” samples last week and “confirmed the presence” of a substance that is blacked out in the filing.

Both sides are due in U.S. District Court on Wednesday, and Mayfield is hoping a judge reinstates him in time to travel to this weekend’s race at Daytona International Speedway.

He’s been suspended since May 9 for failing a random drug test eight days earlier for what NASCAR has deemed “a dangerous, illegal, banned substance.” Mayfield indicated in an affidavit filed last week that he tested positive for methamphetamines, which he denied using.

Mayfield has previously blamed his positive test result on the combination of Adderall for Attention Deficit Hyperactivity Disorder, and Claritin-D for allergies, but that explanation was debunked by NASCAR’s program administrator.

In Monday’s filing, NASCAR claimed Mayfield provided a prescription for Adderall that he received from the “Vitality Anti-Aging Center & Medical Spa” in Hickory, and not his personal physician.

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