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Comment by perpetualcrayon | Hacker News Reader

Come to think of it, given that they state in the article:

  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?

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This was controlled for by the native students, who also experienced any improvement in the city's environment, but did not experience the ban.

Not entirely.

The students who were banned were those visiting from out of country so it's possible to argue that the students performance is increased by preventing them from being drug-tourists. Not sensible, but possible.

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