would think there's some sort of sign if there were sensitive enough recorder there my understanding they have a microphone right on the mouth. >> that goes to my question. the recorder is sensitive enough to pick up labored breathing. >> to find out if somebody is breathing. can you tell if they are breathing. any kind much these sounds would be part of that. would you think they would have been mentioned by the source that said hey we knew he was knocking on the door. if he heard that as well -- >> the other question in terms of medical check ups for pilots, how routine are they? >> in a commercial flight and i would have to check to see if lufthansa has the same one but the u.s. you're doing continual routine checkups. >> if you have somebody running on a treadmill six months ago doesn't mean they can't drop daddy of a heart attack. >> you did develop medical problems. people can have heart attacks