Forensics: Fingerprints Can be Recovered from Fired Bullet Casings

Scientists have developed a technique for retrieving fingerprints from bullet casings and bomb fragments after they have been fired or detonated. The new method, which relies on subtle corrosion of metal surfaces is already being applied for the first time anywhere in the world by two British police forces. The patterns of corrosion remain even after the surface has been cleaned, heated to 600°C or even painted over. This means that traces of fingerprints stay on the metal long after the residue from a person’s finger has gone