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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.
Morally maybe, but legally no. Theft requires criminal intent. If the person is honestly attempting to pay for the goods and errors in the payment method cause an over or underpayment, that's not theft.
It's theft if you know that the item didn't scan and you just bag it anyway. You can ask for help. But no keep stealing and trying to justify it.
It's not theft if it's from Walmart 😉
It's not theft if there's no criminal intent. If the lack of scanning was caused by equipment malfunction then there's no reason to think that they intended to steal.