we then started doing searches around the street location and came up with a kkg reference.it's about 30 to 60 feet from our box. >> narrator: the kkg administrative offices were actually 175 feet from the mailbox on the fourth floor of an office building. but to the fbi, it was more than a coincidence. >> we knew it was a really big deal. it is a way to connect dr. ivins to that crime, to the location where the letters were mailed. >> narrator: at fbi headquarters, they had something they believed was even stronger- - they thought they had caught ivins intentionally misleading them about the alleged murder weapon, rmr-1029. >> it just showed us his willingness and deliberate attempt to mislead us, and actually tell us mistruths. >> narrator: the fbi had found matches between the anthrax in the letters and one particular source. >> samples start coming back positive. and all of those samples that turn out positive have all been drawn up originally from bruce ivins' 1029 flask. >> narrator: but the sample bruce ivins gave them from rmr- 1029 did not match. to investigators, i

he retreated to a -- he would torment only the institution but also certain members of kkg. this was in full evidence after he had received his ph.d. in microbiology from cincinnati over to chapel hill north carolina where he was employed as a researcher and there he met a woman he took a shining too, a doctoral student. and the ansi was an attractive woman, a terrific student in the someone who clearly had what you think it would take to have a dynamic career. the ansi quickly so determined that bruce was a peculiar abnormally stranger and rebuffed his overtures for closer friendship. this enraged him and so he started a campaign against nancy that he proceeded on for decades. most notably in the early stages in 1979 after bruce moved more than 300 miles with the state of maryland he drove back to chapel hill and secretive we broke into a room where the ansi slash notebook was a lot of you i don't know if you appreciate it but we didn't have computers that there were no flesh drives or backups all of her data and experiments, everything her ph.d. hogan was in that note book