This is an interesting idea and certainly the countries that have removed lead from petrol have seen a decrease in criminal activity.
There is an interesting BBC news article about this http://www.bbc.co.uk/news/magazine-27067615
although it stresses that although the decrease in crime is observable the two facts are not necessarily linked.
If you are discussing this with your students, arm them with information about lead, its production and uses by looking at The Essential Chemical Industry online at http://essentialchemicalindustry.org/metals/lead.html
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