This is addressed in the article: "When I first met Theisen, I asked him what would prevent a store manager from standing next to a terminal and repeatedly pre

This is addressed in the article: "When I first met Theisen, I asked him what would prevent a store manager from standing next to a terminal and repeatedly pressing the smiley button, and he said that... the most important information from any location comes from the number of frowny presses, which not even a dishonest employee would be able to undo."