But this relies on the person either being among a pool of suspects identified by the police or having their profile in a DNA database.

BBC: Forensic test can predict hair and eye colour from DNA

It will be part of a number of high profile sporting facilities being set up in the ISV including a 50m international pool along with a 25m warm up pool which is underway at the site.

BBC: NEWS | UK | Wales | South East Wales | City's white water slalom plans