DOVER, Del—NASCAR has toughened its drug policy and will do random tests in 2009 on everyone in the three national series—from star Chase drivers to anonymous tire changers.

All drivers, over-the-wall crew members and officials will be tested before the start of next season, and will also be subject to random tests throughout the year.

The amended policy for the Sprint Cup, Nationwide and Trucks series kicks in at preseason testing at Daytona International Speedway.

“This is more of a reaction to the modern responsibilities that we also have, not just in NAS...

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