Earlier quoted context omitted.
Sure, I'm speculating out my ass here (it's what everyone does on The Internet, right?) Seems to me though, the most recent numbers I've heard for commercial state-of-the-art facial recognition are barely capable of 99% accuracy. I don't know the error rates of fingerprint and retinal scans, but I'd put good money of the combination of passport and fingerprint or passport and retinal scan being several orders of magn…
Why is the accuracy of the technology relevant at all? I think you're assuming that we already have fingerprint and retinal scans of everyone entering, which is quite obviously not true. We might, however, have a rough facial footprint of a known bad actor. I'm fine with this technology being employed in such a manner.
The aggregated individual cost to the 1% false positives - when deployed against a population of several hundred million travellers a year - seems outrageously high to me.