For the first time in 20 years, the United States Centers For Disease Control is considering lowering the threshold blood lead level. The current level is 10 ug/dl and this level dictates how many health agencies address childhood lead poisoning. A recent vote by the CDC Advisory Committee on Childhood Lead Poisoning recommends lowering the level to 5 ug/dl. Apparently, the recommendation was made as the result of mounting evidence that the harmful effects of lead poisoning with lower levels of lead.