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Some Walmart employees say customers are getting hostile at self-checkout — and they blame anti-theft tech
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
Yes, if I get if from the butcher inside the supermarket, it has a "local" EAN13 barcode that "costs" the total of all parts I got.
Sounds like a badly configured system IMO. It shouldn't take things out of stock or prevent rescanning until the sale was actually made (the customer paid).