Has Cleaner Petrol Reduced Crime?

Just read this very interesting article which posits that the removal of lead from motor fuels like petrol may have triggered a reduction in crime in the West, stemming from effects that lead has on the human brain. This lead-crime hypothesis interestingly tracks the levels of crime against the the levels of lead exposure in the USA. Is this a case of spurious correlation or is there a plausible scientific/medical explanation?

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