Under NASCAR's drug testing policy, an individual can bring in experts for the second test and Allmendinger wants his own toxicologist and attorney present, two people familiar with the case told the AP on condition of anonymity Thursday because the process is confidential.
Because Allmendinger is bringing his own people, the test of the sample will not occur until next week. Allmendinger has the right to take the time needed to assemble his team of experts.
Allmendinger was suspended by NASCAR on Saturday for failing a random drug test taken June 29.
A statement released Wednesday by his business manager said Allmendinger tested positive for a stimulant that has not been revealed. Allmendinger has denied knowingly taking a banned substance, and said he is collecting his medications and supplements in an attempt to figure out what got him in trouble.
The 30-year-old Allmendinger is the second Sprint Cup Series driver to be suspended under the NASCAR drug policy implemented in 2009.