How Accurate are Mail-in DNA Tests?

From Healthcare Triage.

Mail-in DNA tests have been in the news recently. Test results can be over the map, with even identical twins getting some widely variable results. What’s the deal with that?

The Vox article: https://www.vox.com/science-and-health/2019/1/28/18194560/ancestry-dna-23-me-myheritage-science-explainer

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