AVONDALE, Ariz. -- In more than a decade of racing in NASCAR's national divisions, Kevin Harvick has never been subjected to a random drug test. But if an official with the sanctioning body were to ask him to submit to one, the Sprint Cup driver would willingly oblige.

"Every driver in this garage should take one, in any garage," Harvick said Thursday at Phoenix International Raceway, site of Saturday night's Subway Fresh Fit 500. "This has always been perceived as a clean sport. Let's not let it be perceived as something that's not clean now. Because it is, for the most part. Let's prove it."

He's not alone. Several other top drivers on NASCAR's premier circuit also voiced support for a change in NASCAR's drug testing policy, which currently is administered only if series officials have a reasonable doubt as to whether a competitor is using. But many drivers seem clearly shaken by the recent admission of former Craftsman Truck driver Aaron Fike, who was suspended from NASCAR after being arrested for heroin possession charges (read more), and told a national magazine that he used drugs on race days.

"I guarantee you, he's not the first guy, and he's not going to be the last guy," said Daytona 500 winner Ryan Newman.

"I cannot believe it. That is absurd," added reigning Cup champion Jimmie Johnson. "I don't know what this means, where things go from here. But I'm so happy they figured out what was going on and got him off the track. That is absolutely unacceptable."

Fike and his girlfriend were arrested this past July while shooting up heroin in the parking lot of an Ohio amusement park. NASCAR suspended the driver indefinitely. Fike told a writer from ESPN the Magazine that he did drugs on race days, specifically before a Truck event at Memphis Motorsports Park on June 30 of last year. That admission was enough for some Sprint Cup drivers to start banging the drum for a drug policy with more teeth.

"I'm all for it," two-time series champ Tony Stewart said of a proposed random testing policy. "I would love it. I've never been asked to take one yet. I think it should be mandatory that we have random drug testing all the time, I think non-stop through the year. Obviously with this happening, we as an organization aren't doing a good job of seeing it before it happens. Aaron coming out and saying that is an indication that we need to do a better job than we're currently doing. But I'm all for random drug testing, from the time we go to Daytona to the time we finish the season at Homestead. I think it's a great idea." (Continued)