While leaving the Kingman, AZ store about 3:30 on September 27, the exit was blocked by three shopping carts having what they had just purchased scrutinized by by a Walmart employee waving her proof of purchase tool like it were a Glock 40. When it finally became our turn she informed my wife and I, I'm 71 by the way, that we had not paid for the slim fast that was in our cart. After I scanned the receipt of $277.66 and not knowing how Walmart abbreviates the purchases made, she took the slim fast from our cart and we left. Once outside, I was able to locate the slim fast by the price on the receipt. The receipt showed SFRTDCAPPU8, Who would have guessed? Once back inside I located this woman still holding the slim fast as if it were some kind of trophy. I Don't think anyone wants to be treated in this manner. The Walmart employee should have looked at the receipt, they should be able to recognize their store codes, not the shopper. I feel this woman had an obligation to check other means to verify the purchase. We'll be shopping at Safeway from now on.