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United States
I’ll do it, but only if you’ll help

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Iris Scans use ordinary photographic techniques (albeit infra-red), but have a very high failure rate: ... which means that, statistically, 2.5 million out of the British population would go unrecognised.

Retina Scans, on the other hand, are far more accurate:

Retinal Scanners would be needed to provide any biometric security at all. Retinal Scanners use lasers to see through to the retina. And they can give you watery eyes:

More spin, I'm afraid. For "Iris Scanners" (OK) read "Retinal Scanners" (NOT OK)
Veronica Chapman, 14 years ago.

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