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Genetic genealogists are working on some of America’s toughest cold cases. While law enforcement DNA databases traditionally look at just 13-20 markers in the genome, these amateurs use 23andMe and Ancestry, which DNA test for 600,000 to 700,000 markers. https://www.theatlantic.com/science/archive/2019/11/when-internet-sleuths-solved-murder-mystery/601636/