CONCORD, N.C. --- NASCAR Chairman Brian France held two town hall meetings Tuesday with the sport's "stakeholders" to discuss everything from its toughened drug policy to the economy, competition and fan interest.

"I learned a long time ago if you get everybody involved, they can't complain," team owner Rick Hendrick said.

The meetings were held at the research and development center a few miles from Lowe's Motor Speedway. Drivers, team owners and crew chiefs were assigned to a session, and the morning group of 53 participants took a little more than two hours.

The second group, which included three-time defending series champion Jimmie Johnson, two-time series champion Tony Stewart and a large contingent from Roush Fenway Racing, met for two hours in the afternoon.

NASCAR had 10 top officials in attendance, including NASCAR President Mike Helton and France's sister, Lesa, an executive vice president of NASCAR.

Drug testing was a main topic of the first session, which included Mark Martin and Ryan Newman, two drivers vocal with their concerns about the policy since Jeremy Mayfield's failed test. He received an indefinite suspension May 9 and, despite calls from drivers, NASCAR hasn't revealed the substance found in his sample.

The secrecy and lack of an official list of banned substances led many drivers to worry their careers could be put in jeopardy by a simple prescription.

"If you're taking something as prescribed, I don't think you're going to lose your career," Martin said. "I feel much better now than I did before the meeting."

There's been differing opinions on the competition since NASCAR switched last season to the full-time use of its "Car of Tomorrow." Though NASCAR has been steadfast in its stance that no changes were forthcoming to the car, France said series leaders will take some of Tuesday's suggestions under consideration.

"Clearly, if there are some adjustments that we learned today that can be incorporated without changing the financial model for the team owners, we want to be open to that," he said.