or his motive of why he would want to do this. mary to will's point about multiple doctors now we're hearing -- and we heard about the note shredded up in his apartment from a doctor saying unfit for duty unfit to work. part of this early motive that's coming out from investigators is this notion that perhaps, you know he was worried that it would get out to his employer to the airline, that because of his medical conditions he'd be yanked out of the cockpit. my issue with that is, so why would you then feel the need to fly and take the lives of 149 people with you? >> well that's a big mystery. but i think the multiple doctors is the key. even under the united states federal aviation regulations, if you're taking more than one anti-depressant, if you have combined your medication, it's the combination effect. if one won't control the depression you can't mix them up. you can't go to several doctors and forum shop for the cocktail of drugs you want. i think without a doubt, he