Great Show.
Please check out this article from January 2013 issue of Mother Jones.

When you realize how much lead poisoning affected the violent crime rate, it's mind boggling.
All the rhetoric and legislation about the war on drugs, building new prisons, and law and order legislation like three strikes, stop and frisk, this was irrelevant to the drop of violent crime in the 90s..
What dropped the violent crime rate happened 20 years earlier when states legislated to get the tetra ethyl lead additives out of the gasoline.
Infants and toddlers who grew up without the lead contamination had lower levels of lead in their bodies, and lower rates of ADD, hyperactivity, impulsivity, and aggression as adults.

http://www.motherjones.com/environment/2013/01/lead-crime-link-gasoline
America's Real Criminal Element: Lead

"New research finds Pb is the hidden villain behind violent crime, lower IQs, and even the ADHD epidemic. And fixing the problem is a lot cheaper than doing nothing."

—By Kevin Drum

January/February 2013 Issue

Gasoline lead may explain as much as 90 percent of the rise and fall of violent crime over the past half century.

10% of 700,000 stops means 70,000 more clients for the prison industrial complex.