How did they know she shoplifted in the first place?
Does the tech also identify shop lifting, or do they just search a database of people convicted of shoplifting (in which case they could have just checked this person's ID and realized it was mistaken identity).
Is being caught shoplifting a credible reason to deny someone access to basic goods indefinitely? What if all supermarkets in a town use the same facial rec service?
Even putting a human being in the loop is trouble prone because people aren't on average good enough at this.
It would be more useful to require a free membership to shop there and validate allowed users via bluetooth and ban users devices and phone numbers.
She didn't.
If random store employees start walking up to people and asking them to show ID, is that an acceptable state for society?
But note that this is the UK. Different issues from the States (where this wouldn't ever pass. We have weak social security specifically becsuse citizens rejected a national ID).