Bank United of Texas' deployment of automated teller machines with iris-recognition technology is bringing new attention to that form of biometric identification-and to questions about cost and accuracy.

The Houston-based thrift is the first U.S. financial institution to announce a broad ATM-network rollout of the eye-scanning method as a security enhancement. Other U.S. institutions have tested the technology, and it is in live operation only at Nationwide Building Society in England.

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