Biffle wreck raised larger concerns 

January, 11, 2007
01/11/07
5:59
PM ET
DAYTONA BEACH, Fla. -- Greg Biffle says he was allowed to leave Las Vegas Motor Speedway without proper medical attention last month after a fiery crash in which he was temporarily knocked unconscious.

He says doctors in Charlotte, N.C., told him he was at risk because he flew home with a slight brain bruise that left vision in his right eye blurred for a day.

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