Police landed on DeAngelo by eliminating possible relatives by sex, age or residence.
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Only a few years from now, the process could be used to track nearly all Americans of European descent by making DNA matches with distant relatives, the authors of the study predict.In the Golden State case, investigators hit the jackpot the suspected killer's third cousins popped up as a match.Police rebuilt the family trees as far back as the 1800s before wading through the hundreds of descendants to try to find their suspect.Thirteen people have been arrested in five months, according to Parabon NanoLabs, a company that analyzed 200 mystery samples.According to Ellen McRae Greytak, the company's director of bioinformatics, 60 percent of those samples had "matches" on GEDMatch that were worth pursuing.to rebuild family trees and identify possible suspects.Legal limbo For the study published Thursday, researchers analyzed the DNA data of the 1.28 million people in the MyHeritage database.Researchers discovered that 60 percent of Americans of European descent had a "match" with a third cousin or someone even more closely related.That means that with samples from only 2 percent of the total U.S. population, all could be identified.
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