One passenger was killed and dozens injured when a Greyhound bus crashed into a highway median barrier in Tennessee in August.
The bus was carrying 45 passengers and was headed from Kansas City to Nashville. The bus was traveling all night and passengers have said the driver was dozing before the accident.
The driver was charged with driving with a license that was suspended in New York in 1987. His license was suspended for failing to pay child support but he somehow obtained a license in Missouri.
Greyhound was unaware of the suspended license because access to motor vehicle records only goes back three years, said a Greyhound spokeswoman.