Lead exposure in childhood can turn youngsters into adult criminals - Daily Mail 28th May 2008

Lead exposure during childhood is associated with brain shrinkage and violent criminal behaviour, research has shown. Scientists based the conclusion on two US studies of families from a poor area of Cincinnati where many houses were old and contaminated with lead. In one, blood lead levels of pregnant women and 250 children born in the early 1980s were matched against information from local criminal justice records.

Link to Article