CHARLOTTE, N.C. -- The "B" sample urine test for suspended Sprint Cup driver AJ Allmendinger will take place on July 24, five days before the Brickyard 400 at Indianapolis Motor Speedway.
The test will be conducted at Aegis Laboratories in Nashville, Tenn., with an independent toxicologist selected by Allmendinger to be present for the procedure as is allowed in the NASCAR rulebook.
Results of the "B" sample test typically take up to five days to be determined, although there was a quick turnaround in 2009 for suspended driver Jeremy Mayfield.
NASCAR officials said they expect the "B" sample test to be completed before the race.
The first practice at Indianapolis isn't until July 28, so if the test comes back negative, Allmendinger could be back in the car for the Sunday race.
Penske officials declined to speculate. But team owner Roger Penske was emphatic following Sunday's race at New Hampshire that Sam Hornish Jr. would be in the No. 22 Dodge at Indianapolis unless the test results were unknown or negative.
The "B" sample rarely disputes the original sample.
Allmendinger's business manager, Tara Ragan, said only that "we are looking forward to hearing the results as quick as possible.''
"AJ and all of us at Walldinger Racing have truly appreciated the outpouring of support from our fans, partners and colleagues,'' Ragan added. "It has meant a lot to us during this difficult time. We also are grateful to Mr. Penske and his management team for their patience and respect of the process we are going through.''
Allmendinger, who already has missed two races, said his initial test taken at Kentucky three weekends ago was positive for a stimulant that could have come from a supplement or over-the-counter drug.
A stimulant is defined in NASCAR's drug policy as "amphetamine, methamphetamine, Ecstasy (MDMA), Eve (MDEA), MDA, PMA, Phentermine, and other amphetamine derivatives and related compounds.
Penske said at New Hampshire that Allmendinger would return to the 22 car if the "B" sample turns out negative. He declined to speculate on Allmendinger's future at Penske beyond this year if the test is positive.
A positive test would result in extending the suspension until Allmendinger completes NASCAR's Road to Recovery program, which typically takes at least five months.
"We have to look at what those circumstances are and what are the issues and talk with the sponsors, and we've got to make that decision,'' Penske said. "Ultimately, that'll be my decision on whether he would come back or not. I don't want to make that call right now.''