Mystery Odor and Mold Inspection

We were asked to come and do a mold inspection in this home because there was a bad odor in this bathroom. The owners thought that it must be dampness related or mold. As it turned out there was no dampness or mold. The odor was coming from the drain of this tub. They don’t use it very often and the water in the p-trap had evaporated and allowed sewer odor to come up out of the drain.