When a paedophile or rapist films their crime, professor Sue Black can track them down using nothing more than the veins, scars and other markings on their hands. One day in 2006, Sue Black, a professor at the University of Dundee’s department of Anatomy and Forensic Anthropology , received a phone call from a man called Nick Marsh. He was a forensic photographer who had worked with Black 17 years earlier as part of a team sent by the Foreign Office to examine the bodies of victims of war crimes in Kosovo.[…]

Source: WIRED.co.uk To catch a paedophile, you only need to look at their hands