I'm about to drop an AAR in the Afghanistan PTP thread, but I just attended a lecture by Gretchen Peters (author of Seeds of Terror, and she made the point that opium cultivated in Afghanistan would have to go through a shift in collection and production methods in order to come close to the hygienic methods required for medicinal purposes. She also added that unless the whole shebang was subsidized, medicinal opium would not likely garner prices higher than the farmer would get for growing wheat.

I found those points very interesting.