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Three test tubes nect to gloved hand

Sometimes a marketing pivot serves a truth-telling function. A new television ad for the consumer DNA database FamilyTreeDNA asks the public to share their DNA with the company not to find out whether they’re at high risk for breast cancer, whether their ancestors were black, or what their Spotify playlist should include. Instead, the father of Elizabeth Smart, who was abducted in 2002, observes that “when a loved one is a victim of a violent crime, families want answers. … If you are one of the millions of people who have taken a DNA test, your help can provide the missing link.”

FamilyTreeDNA makes explicit the use of consumer DNA testing that law enforcement agencies have increasingly relied on to solve cases. When police identified Joseph DeAngelo in 2018 as the suspected Golden State Killer responsible for a series of rapes and murders in California several decades ago, they did so with the aid of genetic genealogy: the combination of genetic matching and traditional genealogical methods. Police uploaded crime scene DNA to GEDmatch, a free service where people... see more