In recent years, there has been much discussion about retailers converting from cashiers to self-checkout. However, this change has frustrated many customers and reduced job opportunities at some stores. But there may be changes at the checkout that reverse these recent trends. Many big box stores and grocers are going back to cashiers. This reversal has nothing to do with consumer complaints. It's all about retail theft. Stores are finding that self-checkout costs them more than they've saved in personnel costs...