NASCAR’s COT poisoning drivers

NASCAR officials are scrambling to solve a couple of potentially serious issues with the "Car of Tomorrow." Denny Hamlin and several other drivers complained about an unusual amount of carbon monoxide in their system after Sunday's inaugural COT race at Bristol Motor Speedway. Some teams had issues with the protective foam in the right side door overheating, melting and producing toxic fumes. Some had springs that failed for no apparent reason, which may have been the reason for the No. 16 car of Greg Biffle being too low during post-race inspection. ESPN.com