Almindinger Tested Positive For A Stimulant

From the Washington Post: Suspended NASCAR driver AJ Allmendinger says he tested positive for a stimulant he did not identify.
A statement Wednesday from Allmendinger’s business manager says the driver is collecting his medicines and supplements to determine if an over-the-counter product caused the positive test.
Allmendinger was randomly tested by NASCAR on June 29, and informed Saturday he had failed the drug test. His suspension was announced hours before Saturday night’s race at Daytona.
 http://www.washingtonpost.com/sports/nascar-driver-aj-allmendinger-says-he-tested-positive-for-unidentified-stimulant/2012/07/11/gJQAUYYPdW_story.html
From Allmendinger's web site:  “In an effort to help our colleagues in the media report on this in a timely and accurate manner, we wanted to provide some additional details regarding AJ’s sample “A” test results. AJ tested positive for a stimulant. He has no idea why the first test was positive, and he has never knowingly taken any prohibited substance. AJ is collecting his medicines and supplements for testing to determine whether an over the counter product caused his positive test. AJ and all of us at Walldinger Racing respect NASCAR's testing program, and he has requested that his "B" sample be tested as part of the process of getting to the bottom of this. We will have the opportunity to review all of the scientific data surrounding the test following the "B" sample test, but our understanding is that AJ's test was slightly above the threshold.
 http://www.ajallmendinger.com/spin.php?id=1045
If true, and the test said the stimulant from an over the counter medicine, this probably will be consider to be a harmless incident.
But it makes you wonder why a driver/athlete would be taking the chance of a positive test if they have to "collecting his medicines and supplements" because this implies that he has used a moderate to high number of medicines and supplements.
Hopefully, this is just a harmless mistake.