Thursday, January 10, 2013

An Astonishing New Argument for Why Violent Crime Rates Have Dropped

Less lead. It’s ridiculous -– until you see the evidence. 

It seemed, at first, preposterous. The hypothesis was so exotic that I laughed. The rise and fall of violent crime during the second half of the 20th century and first years of the 21st were caused, it proposed, not by changes in policing or imprisonment, single parenthood, recession, crack cocaine or the legalisation of abortion, but mainly by … lead. 

I don’t mean bullets. The crime waves that afflicted many parts of the world and then, against all predictions, collapsed, were ascribed, in an article published by Mother Jones last week, to the rise and fall in the use of lead-based paint and leaded petrol(1). 

It’s ridiculous – until you see the evidence. Studies between cities, states and nations show that the rise and fall in crime follows, with a roughly 20-year lag, the rise and fall in the exposure of infants to trace quantities of lead(2,3,4). But all that gives us is correlation: an association that could be coincidental. The Mother Jones article, based on several scientific papers, claimed causation. 

Read on... 

This post is a response to the post that follows.  Tom

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