Re:Major problem (Score 1)

The other part of this problem would be twins. And ageing. Them homozygous twins look awfully similar. Yet I have seen twins who grow different looking - without accidents - simply by ageing. But I con Twin studies are always good in biology. And as you age all of your biometrics will change. You don't develop cataract overnight, nor varicouse veins, and hay fever can be entirely geographical (I sneeze at work but not at home...) - or just taking recreational substances with peripheral vasodilatory effects. So, using a statistically significant number of homozygous twins in a double blind protocol (resisting the retinal scans joke...) any successful biometric would really need to be able to tell them apart. Then they would need to be able to tell the same twins apart a time later. And just to ensure that the biometric is reliable it would make sense to do it over a range of ages.