Fri, 10/13/2023 - 05:11 Tech Insider If the missed-scan detection technology detects a problem a light above the machine illuminates, and it sends a text notification to a handheld device for employees assigned to the area.Getty Images; Shutterstock; Alyssa Powell/Insider Tags Retail, Tech Insider, walmart, Self-Checkout, Retail Source Some Walmart employees say customers are getting hostile at self-checkout — and…