http://www.nascar.com/2007/news/headlines/truck/07/09/afike.drug.charges/index.html
...Poston said NASCAR's drug policy is one of zero tolerance and should be taken seriously. 
If a driver fails a drug test, be it alcohol or chemical related, he or she is suspended indefinitely and pulled from the track. If a driver refuses NASCAR's drug test, he or she is suspended indefinitely as well.
Officials take action based on what they consider to be reasonable suspicion
(such as we don't like you), and Poston said the substance-abuse policy is broad and all encompassing. Also, NASCAR does not have players' unions fighting to block substance-abuse testing, as is the case in other major sports.
(Instead, we don't test drivers unless we don't like them, and other sports test all athletes)
"We have much broader authority than other professional leagues," he said. "We can take action based on physical signs of droopy eyes, slurred speech, etc. And there aren't many secrets inside the garage area so in that respect we have some help there as well."
(So what of Ward Burton )
That said, the sanctioning body will work to rehabilitate drivers found with substance-abuse problems or addiction.
Those drivers who fail the substance-abuse policy will be offered a treatment plan and if the program is completed in the eyes of NASCAR, the driver is considered for reinstatement.
Rehabilitation was offered to recently suspended Craftsman Truck Series driver Tyler Walker, who last month was suspended indefinitely for violating NASCAR's drug policy. However, Poston said he was unaware of any requests from Walker to be reinstated or placed on a treatment program.
While NASCAR is willing to help drivers and offer a second chance, they won't get a third; it's three strikes and you're out, Poston added.
Such is the case with former Busch and Truck series driver Shane Hmiel, who was suspended from competition permanently in February 2006 by NASCAR after failing three substance-abuse tests.
(He was suspended permanently from competition in May 2005, and there was talk about that test being 'inconclusive')
Other drivers to be parked for abusing the policy include Brian Rose, Sammy Potashnick and Kevin Grubb. Rose and Potashnick never returned to the track. Grubb did return, but was suspended indefinitely on Sept. 12, 2006, after refusing to take a drug test. It was his second suspension.
Instituted in 1988, NASCAR feels its drug policy is effective.
(After all, it got rid of Shane Hmiel! 
)
"Everyone understands what it is." Poston said. "The action is swift and impacting."
(This is another line)
