Two and a half years after the fall of the Taliban, Afghanistan is once more lapsing into bloody chaos. Although President Hamid Karzai is strong on paper, he is weak in fact. The drug trade is surging, the Taliban are creeping back, and real power rests in the hands of the country's many warlords. Instead of disarming the militias, Washington is using them to hunt the remnants of al Qaeda and the Taliban. But ordinary Afghans are paying the price.