Recently, ABC (Australian Broadcasting Corporation) ran an item about lead & its effect on the brain, particularly developing brains. It has long been known that lead exposure in childhood has a depressing effect on adult IQ. What is new in the programme linked below, is the relationship between lead exposure in childhood, & violent crime.
Other references:
Jessica Wolpaw Reyes: “Environmental Policy As Social Policy? The Impact Of Childhood Lead Exposure On Crime” http://www3.amherst.edu/~jwreyes/papers/LeadCrime.pdf
Kevin Drum: “New York City's Murder Rate Was Zero Last Monday” http://www.motherjones.com/kevin-drum/2012/11/new-york-citys-murder-rate-was-zero-last-monday
Jonah Lehrer: “The Crime of Lead Exposure” http://www.wired.com/2011/06/the-crime-of-lead-exposure/ / dust site lead exposure delinquency violent crime child child’s mothers blood level lead exposure leaded paint leaded petrol octane highest level of lead exposure early adult criminal career rape murder domestic violence higher childhood blood level blood lead level smaller brain frontal cortex impulse control impulsivity reduction brain chemicals dose dependent IQ scores points soil Pb percent lead parts per million micrograms per decilitre dust children exposure mining smelting refining communities developmental defects death /