Here's a little story about Colorado's use of facial recognition in obtaining driver's licenses. This is an interesting excerpt:
Of the nearly 735,000 applications processed between January and September 2004, motor vehicle officials found 528 fraudulent applications - about a quarter of them solely as a result of the facial-recognition computer program.
However even though the computer can narrow down matches to a handful versus a score of people in the database, a human touch is still needed to make that final confirmation. When the computer notices similarities, it's up to an investigator to decide if it's the same person.