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Christine and Erik Johnson of Minneapolis were thrust into the role of detectives when they learned in November 2006 that their 9-month-old son, Coen, had a blood lead level about five times the national average for children under 5. His 2-year-old sister, Nora, had a lead level that was almost triple the average.
The Johnsons were mystified because earlier that year their house got a clean bill of health. Their county housing department verified that the couple had cut lead exposure hazards in their 84-year-old home by taking steps such as replacing old windows covered in lead paint, a major source of lead poisoning in the U.S.
After the toddlers' blood ...