AJ Allmendinger tested positive for some sort of amphetamine, his business manager told several media outlets on Wednesday night.
FOXSports.com, ESPN.com and the Associated Press all quoted Allmendinger representative Tara Ragan as saying the NASCAR driver's suspension was due to an unspecified amphetamine. Ragan had initially termed the drug as a "stimulant."
In the reports, Ragan said she and Allmendinger still didn't know the exact nature of the substance. But NASCAR spokesman David Higdon told Sirius XM radio that Allmendinger had been notified of specifically what he tested positive for.
Higdon also characterized Ragan's statement that Allmendinger was just "nanograms" over the accepted limit as "innaccurate." The spokesman said Allmendinger was significantly over the limit.
NASCAR is allowed to release the specific substance but has declined to do so due to privacy concerns. Allmendinger has already said he will accept NASCAR's recovery program in an attempt to be reinstated into the sport as soon as possible.