Mold is a fungus that exists virtually everywhere outdoors. The question indoors is never 'is there mold' — it is 'is there amplification' — i.e., is mold growing on indoor materials at levels above the outdoor baseline?
Three conditions are required for indoor amplification: a moisture source, organic material (drywall, wood, dust), and time. Eliminate the moisture and the biology eventually stops. That is why every credible mold investigation starts with moisture diagnostics.
Air sampling is interpreted in context. A single indoor sample is meaningless without a simultaneous outdoor control collected under similar conditions. Indicator species (Stachybotrys, Chaetomium, Memnoniella) carry more interpretive weight than total spore counts alone.
If your home has visible growth larger than ~10 sq ft, a written protocol from an independent assessor is the right next step. Smaller areas can often be addressed by the homeowner per EPA guidance.