Correction: In an earlier version of this story, we said Brian Dripps was charged and convicted for the murder of Angie Dodge. He has been charged, but not convicted. His trial is set for June 2021. NewsHour regrets the error.
Genetic genealogy, the technique millions of people are using to learn about their family history, has now become a potent tool with which law enforcement can solve crimes. But the method has major privacy implications that are prompting some critics to urge that we slow down in our adoption of it. William Brangham shares a “cautionary tale” of how one person’s DNA testing can have a wide impact.
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