Found this in My Texas Real Estate Principle 2 Book
"TMARR requires that all persons who conduct assessment and remediation of mold be properly trained and licensed by the state.
Under the rules, a person is not required to be licensed to perform mold remediation in an area in which the mold contamination affects a total surface area of less than 25 contiguous square feet. Also, an owner, or a managing agent or employee of an owner, is not required to be licensed to perform mold assessment or mold remediation on a residential property which is owned by that person, and which has fewer than 10 residential dwelling units. This exemption applies regardless of the total surface area within the residential property that is affected by mold growth.
An insurer may not use an underwriting guideline regarding a residential property insurance policy based upon previous mold damage or a prior mold damage claim filed either by the applicant or on the covered property if:
It is inspected by an independent mold assessor or adjuster, who is licensed to perform mold assessment who provides to the property owner written certification on a Certificate of Mold Damage Remediation (MDR-1) that based on the mold assessment inspection, the property does not contain evidence of mold damage."
I would think it would be a great idea to ask the seller for a MDR-1 form to cover yourself going forward. Hope this helps!!