My guess is that no inspector has seen it yet and no one's reported it. We had a brief mold problem when our roof was leaking. They fixed the roof and really cleaned out the storage space that was affected by the leak. We haven't had a problem.
I'm a human mold detector - horribly allergic to the stuff - within minutes of being near it, the unmistakeable symptoms start. (Itchy, swollen eyes, stuffy head, runny nose. The worst part is the coughing and choking. The breathing trouble is really scary.)