FILE In this May 31, 2011 file photo rescue personnel ...

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Steve Helber | published: June 12, 2011

FILE In this May 31, 2011 file photo rescue personnel work on bus that overturned in Bowling Green, Va. Prosecutors have charged Cheung, 37, of Flushing, N.Y., with four counts of involuntary manslaughter. But sleep scientists, safety advocates and labor leaders say the roots of the accident lie with an industry whose economic model often results in drivers on the road with too little rest and at hours when their bodies naturally crave sleep. (AP Photo/Steve Helber, File)



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