The woman featured, CeCe Moore, is quite clever, going far beyond simply examining genealogical matches to track potential suspects.
parabon-nanolabs.com
https://www.newyorker.com/magazine/2021/11/22/how-your-family-tree-could-catch-a-killer
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Genealogists grew interested in genetics at the turn of the
millennium, when it became possible to analyze bits of information from the Y chromosome—known as Y-DNA—on a commercial scale. Because the Y chromosome is passed from father to son with little mutation, and because surnames historically were passed down the same way, it seemed worth exploring whether the confluence could be useful to researchers. In the late nineties, Bryan Sykes, an Oxford geneticist, persuaded forty-eight men who shared his surname to take Y-DNA tests. “Sykes” comes from a Middle English word meaning “spring” or “stream,” and the name was thought to have arisen separately among unrelated families that lived near various sources of water. But the genetics suggested that the men descended from a single ancestral line. “If this pattern is reproduced with other surnames, it may have important forensic and genealogical applications,” Sykes concluded.
Theoretically, researchers could use Y-DNA to establish the pedigree of a man with an unknown identity. Sykes made a similar case for mt-DNA, which is passed down on the maternal line, in a book titled “The Seven Daughters of Eve.”
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The first step was to establish a DNA profile for the adoptee in a database like GEDmatch, to look for partial genetic matches with other users. The people linked with those matches were not always easy to identify; some users logged on without any personal information or, worse, under aliases. But, when the genealogists succeeded, they could trace back family trees until they identified common ancestors. Then they would reverse the process: starting from the common ancestors, they would build a complete tree of all the descendants, knowing that the adoptee’s parents had to be among them. The amount of DNA that the adoptee shared with matches in the database was a key clue to where he or she belonged in the larger tree; personal details, like birth dates and geography, could also provide clues.
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