(a) The department by rule shall adopt a policy that requires a business holding a structural pest control business license to be inspected by a field inspector at least once:
(1) in the business's first year of operation; and
(2) every four years after the first year of operation.
(b) The department by rule shall adopt a policy and guidelines for conducting an investigation under this chapter, including:
(1) procedures for investigating a complaint concerning misuse of pesticides, including contamination by pesticides and human exposure to pesticides;
(2) the circumstances in which a case should be referred to the:
(A) Department of State Health Services;
(B) Texas Commission on Environmental Quality; or
(C) United States Environmental Protection Agency;
(3) recommendations to consumers and applicators regarding cleanup after a spill or misapplication; and
(4) procedures for residue sampling, including the circumstances in which to take a residue sample and the time in which the sample should be taken.