NASCAR fans are pouring into Sonoma County Friday night and gearing up for the weekend's Sprint Cup race, the Toyota-Save Mart 350.
Some of the top drivers in the world will be battling each other to prove they're the best and the fastest.
And behind the scenes, officials are using a lot of high-tech to make sure no-one is cheating. Watch the video above for Jonathan Bloom's full report.
Officials use high-tech gadgets to detect cheating at Sonoma NASCAR event