The average person recognizes 5,000 faces |Nature Briefing

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Today we learn about supercharged crime-scene DNA analysis, discover a US penny on Mars and read the the IPCC climate change report in the form of emojis. 

 

The long reach of law enforcement could now extend into our DNA. (Rick Bowmer/AP/Shutterstock) 

Police could search DNA links of most Americans 

It could soon be possible to search crime-scene DNA for links to nearly all people of European descent who live in the United States. A new study reveals how easy it is to identify a particular person on the basis of their DNA, by connecting them to very distant relatives who have chosen to use consumer-genetics services. The technique works best for Americans with European ancestry, because they make up the vast majority of those services’ customers. 

A separate study showed a method for extrapolating the kind of DNA profile used by consumer services from the type used by the FBI. Although it has restrictions, the technique would make it even easier to tap large, public genetic databases for forensic investigations. 

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Reference: Science paper & Cell paper