Latent or hidden fingerprints on guns, knives or shell casings are often the best evidence in court, but getting a clean print is difficult. This new technique enables crime scene investigators to create a negative image of the fingerprint without damaging it.

Foreigners leaving the country through any of the nation's 30 busiest airports would undergo mandatory fingerprinting under an amendment senators added to an immigration bill.

The Maryland Senate approved a comprehensive gun control bill that includes a ban on assault weapons and fingerprinting for prospective handgun buyers.