Police around the U.S. have embraced “genetic genealogy,” which uses DNA consumers offer up to the internet to identify criminal suspects. The method has helped solve rapes and murders dating back to the 1970s. But a key facet of this powerful tool is its most controversial: it can build a detailed picture of people who have never given a sample of their DNA.

Video by Angus Bennett and James Bullock

#Storylines #Crime #BloombergQuicktake

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