In early March, 2003, investigators turned to Tony Frudakis, a molecular biologist who said he could determine the killer's race by analyzing his DNA. They were unsure about the science, so, before giving him the go-ahead, the task force sent Frudakis DNA swabs taken from 20 people whose race they knew and asked him to determine their races through blind testing. He nailed every single one.
http://www.wired.com/science/discove...urrentPage=all"DNA study reveals racial differences"
So far, the differences in DNA variations among the race found by the investigators tend to be shorter in DNA from Africans than from elsewhere, which "is strong support for the out-of-Africa hypothesis" for the origins of all humans, said Ellen Clayton, director of the Genetics and Health Policy Center at Vanderbilt University in Nashville, Tenn.
"It suggests that populations that exist in Africa are more ancient, so there's been more opportunity for DNA recombination than relatively more recent populations, namely those everywhere else," Clayton said.