Re:Retina or nada (Score 1)

Yes, I totally understand your reasoning. Full disclosure - I actually co-own a biometrics technology firm. We support two types of vascular biometric readers: The palm vein reader from Fujitsu and the finger vein reader from Hitachi. Neither of these devices also capture fingerprints. Check them out if you are interested and I'm happy to answer any questions about biometrics.