CNN bans Canadian bus company in fatal crash . Driver in crash that killed more than 100,000 worked 70 hours in two weeks , agency says . Bus firm Mi Joo Tour & Travel Ltd. has history of violations , records show .
U.S. Department of Transportation bans Canadian bus company in fatal crash . Driver in crash that killed nine worked 92 hours in seven days , agency says . Bus firm Mi Joo Tour & Travel Ltd. has history of violations , records show .