Maintains a certified lead risk assessor on staff to conduct environmental lead investigations when indicated as a part of a work-up of a child with an elevated blood lead level. Elevated lead levels, untreated, can cause neurological and developmental abnormalities in children; adults may also be affected by elevated lead levels. The investigation consists of taking and reviewing a thorough medical history to identify possible sources of exposure, and based on this may include sampling paint, dust, soil, and water from the environment in which the child lives, and interviewing families regarding behavior and activities to determine the most likely source(s) of exposure.