Childhood lead exposure associated with criminal behavior in adulthood / Eurekalert.org, 27 May 2008
http://www.eurekalert.org/pub_releases/2008-05/uoc-cle051908.php
"Based on long-term data from a childhood lead study in Cincinnati, Ohio, Kim Dietrich, PhD, and his team have determined that elevated prenatal and postnatal blood-lead concentrations are associated with higher rates of criminal arrest in adulthood."