How to Fingerprint a Bullet, the High-Voltage Way

Most criminals aren't known for their smarts. They're certainly no match for Bond, John Bond. The head of forensics at the Northamptonshire Police in the UK has found a new way to reveal fingerprints on shells left behind after a shooting. His work builds on the recent discovery that the extreme heat released when firing a gun causes salt from finger sweat to slightly corrode the casing.
As we've learned from CSI, fingerprint experts typically coat casings in vaporized superglue to turn the prints white, but that works only if the sweat hasn't dissipated. Bond realized that by applying electricity instead of glue, prints can be detected years after a bullet is fired. He has already helped the police in Kingsland, Georgia, identify prints on four shells from a 1999 crime scene, and he's working on others. Here's how it's done.
http://www.wired.com/science/discoveries/multimedia/2008/11/st_fingerprints

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