Not like it hasn't happened before.
Doubt it. If Speaker recorded converstations with his doc that indicate that, then we would have heard them by now. In any case, CDC reports that he was told not to travel.
http://www.cnn.com/2007/HEALTH/conditions/06/01/tb.flight/index.html
In this link, and in a report on Neal Boortz' site (as of 01 June), there are statements which indicate that a taped conversation was made during which, allegedly, CDC told his father that there was no risk of contamination to others. Supposedly, Speaker has a tape of CDC telling him not to travel. Again, supposedly, they did this because they felt they had to warn him not to travel to cover their own butts.
http://boortz.com/nuze/index.html
I dunno where the truth lies, probably a mixture of what we hear from both sides. I still wonder...if he was so problematic for others, why has his family tested negative?
This reminds me of the asbestos scare of a few years ago. What some folks don't realize is that only a particulate size of 'X' will pass through the breathing system and cause problems while the rest will be expelled.