Las Vegas airport controller heard slurring her words as alarmed pilots respond

LAS VEGAS -- Federal and airport authorities are investigating why an air traffic controller became incapacitated and went silent while working a night shift alone in the tower at busy McCarran International Airport in Las Vegas. CBS News correspondent Kris Van Cleave reports that in air traffic audio of the incident, the controller appeared to become incoherent and eventually unresponsive until she was discovered by another controller returning from a break. "The FAA is very concerned about thi