Most People of European Ancestry Can Be Identified from a Relative’s DNA

October 11, 2018

(The Atlantic) – These cases are not exceptional, according to his analysis, now published in Science. Golden State Killer investigators found their suspect through third- and fourth-cousin matches in a database called GEDmatch, which includes information from about 1 million people. In a database of that size, Erlich and his co-authors show, nearly 60 percent of people have a relative who is a third cousin or closer. With the growing popularity of DNA tests, such databases are only getting bigger and bigger. It’s not hard to imagine being able to identify nearly every American through a relative’s DNA.