Shoplifting has become a growing problem for retailers partly because stores have made stealing easy. Self-checkout has made it very challenging for a retailer to know when a customer has made a reasonable effort, but an item did not scan and when the customer intended to steal the item.
Accusing a person of shoplifting also has its problems, In theory, cashiers and other store personnel can do this, but that creates a somewhat dangerous situation.
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In most cases, it takes multiple thefts for a person to be confronted over shoplifting. That does eliminate frequent thieves, and it's generally driven by store security, making it safer for workers, but that's only a small piece of the problem.
Iceland, a grocery cha