(a) Environmental lead investigations are a benefit of Medicaid for all THSteps clients with elevated blood lead levels as specified by federal guidelines.(b) The investigation to determine the source of lead is:(1) subject to the requirements in §37.338 and §37.339 of this title (relating to Reporting, Treatment and Investigation of Child Blood Lead Levels);(2) conducted by certified lead risk assessors who are employed by or contractors of the state health department or local health departments; and(3) limited to the child's home or primary residence.