Walmart shoppers say they are fed up with the store's self-checkout system

• Walmart uses automated missed-scan detection to reduce theft at its self-checkout kiosks.
• Workers told Insider the tech has led to confrontations with customers who trigger the alert.
• But shoppers say they've felt "treated like thieves" due to honest mistakes and technical glitches.

Charles Bisbee was scanning and bagging groceries recently in the self-checkout lane of his local Walmart in Alamogordo, New Mexico, when he says an employee approached him, reached into his bag, and pulled out a container of energy drink mix.