A revolutionary genetic editing technique designed to repair faulty DNA could be used by criminals to evade justice, experts have said.

The Crispr system acts like molecular scissors to snip away damaged genes and replace them with healthy code and it is hoped it will one day fix genetic diseases such as sickle cell anaemia, cystic fibrosis and muscular dystrophy.

But Professor George Church, of Harvard University, who pioneered the use of the Crispr technique, said it would be possible for criminals to use the technique to disappear from forensic databases or evade detection.

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