DARLINGTON, S.C. (AP) -- NASCAR driver Jeremy Mayfield has been suspended indefinitely after failing a random drug test.
The result stems from a test last weekend at Richmond International Raceway.
NASCAR spokesman Jim Hunter will not reveal what banned drug Mayfield used. Hunter said it was not an alcohol-related offense.
Mayfield failed to qualify for Saturday night's Sprint Cup race at Darlington Speedway.
He is driving this season in a car he owns himself. Although he raced it into the season-opening Daytona 500, he has failed to qualify for six of the 11 other Sprint Cup events this season.
Mayfield is the first driver suspended under NASCAR's improved substance abuse policy, which went into effect this season.