We’ve all heard the feel-good stories about DNA testing exonerating the wrongly accused, catching a killer or reuniting long-lost relatives. These situations are often framed by local news anchors and law enforcement as triumphs of technology, and sometimes they are. But voluntarily submitting your DNA to a genealogy testing company—as 21% of Americans have, according to a 2025 YouGov poll—can have unintended consequences. I can hear you thinking: What could be the harm? I’m not a criminal! And I would love to meet my fourth cousin twice removed ! Of course, a family reunion sounds fun (and hopefully you’re not on the FBI’s Most Wanted list), but once you give that spit or swab sample over to one of those companies, the “good” and “bad” tentacles of DNA testing can be impossible to untangle. “Nobody is against catching serial killers,” says Natalie Ram, a professor of law at the University of Maryland Francis King C...
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