Detailed text transcripts for TV channel - MSNBC - 20130410:00:49:00
For another industry. current research has not shown that having more than one or two concussions leads to problems. it is important to understand there is no magic number for how many concussions is too many. is that the kind of document you're talking about? >> well, yes, sort of. it's still all this information is still relatively new. we still don't know a lot as to why some guys, you know, get ctd and they have it really bad and some guys who have passed on, they've had the brain scan and they showed the black cloud or dust that's on the brain, which is ctd and some guys have dementia, bu...