childhood. she says ivans had the bondage fixation. >> the bondage and blindfolding. if you look at that on top of everything else as well, you know, he started that behavior when he was 5 years old. a 5-year-old doesn't come up with that on their own. that's either something that was shown to them, taught them, something he had seen done to someone else. a 5-year-old just doesn't start blindfolding their teddy bears and acting out toward their stuffed animals like he did. >> reporter: he was also fascinated with codes and puz e puzzles. >> just secrets, period. anything to do with codes and, you know, tricking people and figuring it out and trying to baffle people. >> reporter: and the greatest secret of all, if ivans committed the anthrax attacks,