Gil Kerlikowske, Barack Obama’s drug tsar, has said 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 US 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 US inner cities, the issue has not come up on the campaign trail of either Obama or his Republican presidential opponent, Mitt Romney.

Al Jazeera’s Fault Lines presenter Sebastian Walker went to Baltimore, one of the country’s most dangerous cities, and found that it is African-Americans who pay the greatest price in this war.