And how did they track him three a genology website. >> they used his d.n.a. from the crime scene. they needed to get it into a compatible format with the public website ged match. that was a different process than the d.n.a. process. this wasn't through their codis law enforcement database. they had to use geno typing or full agai genetic sequencing. genetic markers in ged match to compare it to other people. uploaded that file and ran it against everyone else who is already in that database looking for people who shared significant amounts of d.n.a. with him. >> martha: incredible. it really...