I believe based on what I have read that the turn around in crime in New York in the early 90's was not due to Rudolph Giuliani's zero tolerance policy but to a well know court case and decision called 'Roe v Wade'.
It allowed for the introduction of limited abotion in the United Sates.. A compelling argument for this hypothesis is put forward in 'Freakonomics'
It allowed for the introduction of limited abotion in the United Sates.. A compelling argument for this hypothesis is put forward in 'Freakonomics'