FBI Watching You

FBI is rolling out a nation-wide facial recognition system, but will it catch more than criminals?
3:00 | 09/10/12

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Transcript for FBI Watching You
this evening about the fbi's move to use new science against criminals in this country. Eye scans and other so-called biometrics on street corners and in surveillance cameras that scan our faces as we walk by. Here's abc's reena ninan now. Looks like we got a head. U.S. Marshals. Reporter: You've seen it on tv. Got a facial recognition match on the father. Reporter: And in the movies for years. Now it may soon be coming to a city near you, the fbi's billion dollar project will use available surveillance cameras to scan faces and match those images against their national database of known criminals. Dubbed the next generation identification program, face recognition, dna, iris scans and voice identification will make it harder for the most wanted to hide. Some worry about the potential to invade privacy, others believe it's a crime-fighting tool whose time has come. You've got to go after them where they are, and you've got to go after them smart with intelligence and special operations. Reporter: As we approach the ANNIVERSARY OF SEPTEMBER 11th, A New bulletin obtained from abc news from law enforcement says officials have been told of a decline in 9/11 messaging by al qaeda, but warned lone offender threats are still a concern. Security sources tell us attacks by lone wolves are harder to track making this new technology all the more useful. I'm placing you under arrest for the future murder of sara marks. Reporter: Even if we're nowhere near being able to predict crimes before they happen. The fbi tells us the program will be fully running in less than two years and the next phase will include identifying scars and even tattoos. David. Reena ninan in washington. Reena, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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