Kentucky Fried Rat

The ABC7 site just ran a story about a Kentucky Fried Chicken (KFC) customer that had a rat included in her order. Back when I was teacher at the University of Pennsylvania (we're talking about 40 years ago), stories like that would surface about the KFC closest to the campus. The main difference between then and now is that now those stories tend to be reinforced with photographs and/or videos, which does a lot for their credibility. Nevertheless, when we think that this is a problem that has been around for 40 years, we have to wonder why KFC has never done anything particularly effective about it. Is it like the Pinto gas tank, where some bean-counter decided that fixing the problem cost more than compensating for it when it arises? Could it be that the rats are more intelligent than most of the KFC staff?