The result of AJ Allmendinger's final hope to be immediately reinstated into NASCAR competition will be known within the next 48 hours.

Allmendinger's 'B' sample is scheduled to be tested this morning at 9 a.m. Eastern time, with the driver and his selected toxicologist on hand to observe the procedure at the Aegis Analytical Laboratories in Nashville.

NASCAR allows a person failing the 'A' sample to designate an independent toxicologist to witness the 'B' sample testing. After the sample is tested, results are expected to be made public either Wednesday or Thursday.

If Allmendinger's 'B' sample is negative for what his business manager said was a "stimulant," then the driver will be reinstated immediately and could drive for Penske Racing at Indianapolis this weekend.

But if the second test confirms the positive result, Allmendinger's "temporary" NASCAR suspension will become an "indefinite" suspension. If the driver wants to return to stock car racing's big leagues, he'll have to complete a difficult "Road to Recovery" set forth by NASCAR's substance abuse program administrator.

That process, which is tailored to each individual, could take at least four or five months. And by that time, Allmendinger may not have a team to return to.