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this body burden.” The audience already knew that children living “in the urban American ghetto, and whose blood levels are consistently higher than their middle class counterparts, are known to have an increased prevalence of mental retardation, learning disabilities and behavior disorders.”34 Needleman challenged the scientific community to take the next step, to find out whether or not relatively low-level exposure to lead would produce damage. “If a means could be found to identify older children considered asymptomatic with elevated body burdens of lead, the measurement of their neuropsychologic performance, controlling for other factors known to produce developmental deficits, would allow the investigator to more accurately investigate the effects on their brains of sub-clinical exposure.”35
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