Where Have All the Crackheads Gone?

Yesterday we mentioned how we often see lots of crack being smoked in the boarded-up window across the street from our Tendernob window. But after thinking about it some, we realized we haven't seen any such riff-raff in quite some time. Does anyone know the deal? Did they do a sweep of all the dealers in the Tenderloin recently? Are they in jail or just in a different neighborhood now? When can we expect things to go back to (ab)normal?