Law enforcement’s use of genealogy databases | |
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RegalBeast
User ID: 83394260 United States 05/31/2022 10:28 PM Report Abusive Post Report Copyright Violation | The method is the sample is tested by a DNA company (which is not the known DNA sites by the way). The test looks at about 700,000 SNP markers across 23 chromosomes assuming the sample is good quality. These markers are exported as a simple text file consisting of a position along a chromosome and a pair of letters (A, C, G or T). The police (or a hired genealogist) uploads that text file to Gedmatch or MyHeritage and the site find DNA matches based on the markers. The matches are often distant cousins to the sample which in that case take a lot of tradition genealogical research to work out the possible people the sample could belong to. The genealogist that helped find the Golden State Killer only got like 2nd and 3rd cousins matches off the sample. Then she had to figure out the common distant ancestor to all those matches and then starting with that ancestral couple she had to trace down to EVERY living descendant and find men that could be placed near the crimes. A living suspect was narrowed down and the police pulled DNA from his trash and it perfectly matched the old sample. He is now in prison. Last Edited by TexasPaleo on 05/31/2022 10:33 PM |