According to a fresh report from Dan Gelston of the Associated Press, Denny Hamlin suffered carbon monoxide poisoning, nausea, and double vision during the Gander RV 400 at Dover International Speedway on Monday.
Denny Hamlin suffered from nausea and double vision at Dover. Carbon monoxide seeped in from a damaged right rear crush panel.
— Dan Gelston (@APgelston) May 7, 2019
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Hamlin hit a piece of debris on the track which damaged the right rear crush panel in the No. 11 Toyota Camry which led to the leak of carbon monoxide inside the cockpit.