Better check the epa site on elimination and characteristics of different types of mold. Also your local environmental health department. This has become a fad but necessary business the past few years because of legal settlements. Insurance companies are writing exclusions from it because the settlements can be huge. People are affected differently by different kinds of mold. Mold is a normal part of air and does require moisture to live but can become dormant.
Most states have disclosure laws. Check with your consumer protection department or spend a free office call and call an attorney. They can advise on your state law.
You have a responsibility to your mortgage and insurance company.