Retailers are pulling back from self-checkout after years of theft, errors, and questionable time savings
(www.techspot.com)
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I personally find there needs to be more interaction in self checkouts as they often error meaning you need to wave down / seek out someone to help.
Like what?
There is only 2 instances I've ever need staff assistance. For age check (regular), and when there is a error with the card terminal (very rare). What other errors can there be?