Gil Kerlikowske, president Barack Obama's drug czar, has said that the US war on drugs has not been successful and that "It's very clear we can't arrest our way out of this
problem."

But despite promises by the president to re-evaluate US drug policies - more than half of Obama's drug control budget continues to go towards law enforcement.

And as the war on drugs rages in America's inner cities, the issue has not come up on the campaign trail of either President Obama or his Republican opponent, Mitt Romney.