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national police authorities of their individual countries. i have to say, wolf although i've also been a proponent of keeping terrorism option it does seem unlikely baring in mind the circumstances of this case. >> peter, you have done investigations when you are at the ntsb in which you looked at the pilot or the co-pilot. what are you looking at when you take a close look at those two men or women in the cockpit? >> you review their behavior over the past 72 hours, over the past week. you look at their bank accounts. you interview their family and friends to see if they were under any particular stress whether there was anything new that happened in their lives that might have lent them into a depression. there's lots of things you would look for just to see if there was anything out of the ordinary. 99.9% of the time you find nothing. but you have to look. >> one famous case where you did