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Mole. you got blink rate and pupil dilation and body language and choices of words and things, and he was just screaming deception from the first night he was talking to law enforcement until he was on the witness stand, and anyone that's trained at all and those with reasonable instincts can tell he was lying. and i think he took it out of desperation. i think they thought once he was found to be on the videotape , the audiotape. >> that he had been at the site. >> and lied about it, they thought we are dead in the water, so we have to swing for the fences and hope we can connect with one jur...

He's probably been told where he's going. whether he believed his captors or not is another question. he resigned to his fate. we've heard the story of writing p@3nestion mark in the helicopter, are you americans or not? he's not sure to the end. i don't know he knew five years ago -- >> does it look like -- i mean, look -- when i see this, it looks like maybe he was in the darkness prior to this because he looks like he's having trouble adjusting his eyes. there is talk about the blink rate, buck. when you see it as a former cia guy, how would you analyze his berave your and appearance, clea...

He's probably been told where he's going. whether he believed his captors or not is another question. he resigned to his fate. we've heard the story of writing p@3nestion mark in the helicopter, are you americans or not? he's not sure to the end. i don't know he knew five years ago -- >> does it look like -- i mean, look -- when i see this, it looks like maybe he was in the darkness prior to this because he looks like he's having trouble adjusting his eyes. there is talk about the blink rate, buck. when you see it as a former cia guy, how would you analyze his berave your and appearance, clea...

Our cortisol levels shoot up, that's congruent in his stress on his face, increased blink rate. >> could we tell his health based on the video that we just see when he was sitting in the vehicle, walks across the field, boards the u.s. military helicopter? could you get a sense watching that frame by frame? is the guy healthy, not so healthy? >> hard to dictate whether or not he's healthy. a state of almost shock, his blink rate, average blink rate of an individual 15 to 25 times a minute, but what we see with him in that one clip where he's smiling, eight second his blinks 18 times. that's he...

We see a nervous laugh, almost relieving stress. he's surrounded by taliban gunships overhim, there's a lot of stress around him. we also see it in his blink rate. >> david, you've written a lot of books on this stuff. the interaction he seems to have with his taliban captors, what do you make of that? >> well, the thing we're most curious about whether he in some sense felt part of his captives' -- captors' world, whether there was a stockholm syndrome kind of experience for him. i don't mean to sound glib but there's a way in this amazing video look like a tease for an episode of "homeland" ...