The following is an excerpt from a conversation between the store manager of Trader Sam's Grocery Stores, Jennings Maloy, and Sam Burley, president of Trader Sam's Grocery Stores.objs. 4, 5

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Sam: Jennings, I'm concerned about this new scanning system. Jennings: What's the problem? Sam: Well, how do we know the clerks are ringing up all the merchandise? Jennings: That's one of the strong points about the system. The scanner automatically rings up each item, based on its bar code. We update the prices daily, so we're sure that the sale is rung up for the right price. Sam: That's not my concern. What keeps a clerk from pretending to scan items and then simply not charging his friends? If his friends were buying 10-15 items, it would be easy for the clerk to pass through several items with his finger over the bar code or just pass the merchandise through the scanner with the wrong side showing. It would look nor- mal for anyone observing. In the old days, we at least could hear the cash register ring- ing up each sale. Jennings: I see your point. Suggest ways that Trader Sam's Grocery Stores could prevent or detect the theft of merchandise as described.