It might be interesting for them to keep track of how long it takes the black market to reappear, and see whether the negatives that come along with allowing criminals to monopolize the business of dealing drugs to people in the area reappear also.
drug tourism was posing difficulties for the city
I wonder if they take into account the fact that these "problems" could've been affecting students and their grades as well. What happens if only the "drug tourism" disappeared?