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Kevin Drum at Mother Jones has an essay with the same title as this post articulating one of the most robust among many competing hypotheses regarding the remarkable drop in US crime rates over the last 20 years: That it correlates with the presence of lead (Pb) in the the environment. Concluded Drum, provocatively, "If you gave me the choice, right now, of spending $20 billion less on prisons and cops and spending $20 billion more on getting rid of lead, I'd take the deal in a heartbeat."
The theory has been around for a number of years but Drum does a good job explicating the subject for those unfamiliar with the research.
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