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Close up of an eye with a red filter, and on the eye's iris, it is blue

Police with no leads can now predict the eye colour of their suspect from DNA recovered at the crime scene. It's the first time such a tool has been available.

Manfred Kayser at Erasmus University Medical Centre in the Netherlands and colleagues have developed IrisPlex, which can predict with 94 per cent accuracy whether a person has blue or brown eyes from a sample of DNA.

The Dutch Ministry of Security and Justice is expected to approve the kit in the coming weeks, while the UK could use it immediately.

It is the first validated tool to help police home in on a possible suspect by predicting a visible trait, says Kayser. This could be useful in cases where police have DNA from a crime scene, but can't find a match on a DNA database. It is not accurate enough to secure convictions in court, however.

IrisPlex examines six single-letter variations in DNA, known as single nucleotide polymorphisms (SNPs), which have been strongly linked to eye colour, and categorises them as blue, brown or "undefined" - an intermediate...