Comment Re:99.98% (Score 2) 121
Even if we discount various other confounding factors, and assume in good faith that the 99.98% "accuracy" is somehow meaningful on individual recognition basis one should consider this:
Sainsbury's stores serve millions of customers per week. As per usual, they do not seem to be publishing any current customer amounts themselves, but https://rspo.org/members/3-001... claims "Over 16 million customers visit 740 Sainsbury's stores each week", and that was nearly 20 years ago.
Assuming that figure has any truth in it, it would mean over 160 thousand mis-identifications per year (52 weeks * 16M customers / week * (1 - 0.9998)).