Lead poisoning linked to delinquent behaviour January 27 2003 at 06:27AM Pittsburgh, Pennsylvania - Children exposed to lead have a much greater chance of developing delinquent behaviour, researchers say. Dr Herbert Needleman, of the University of Pittsburgh in the United States, examined 194 youths convicted in a juvenile court in Allegheny County, Pennsylvania, and compared them with 146 non-delinquents from high schools in Pittsburgh. He found the delinquent youths had significantly higher average concentrations of lead in their bones - 11 parts per million, compared with 1,5 ppm in the control group. The research, published in the journal Neurotoxicology and...