The FBI is consulting local police and vendors about technology currently in use that can spot crooks and terrorists by interpreting the symbolism of their tattoos, according to government documents. The inquiry follows work already underway at the bureau and Homeland Security Department to add iris and facial recognition services to their respective fingerprint databases.What is described is more of a pattern recognition system but it is related to biometrics.
The FBI on Friday issued a request for information on existing databases “containing tattoo/symbol images, their possible meanings, gang affiliations, terrorist groups or other criminal organizations.”
See: Biometrics, object recognition and search