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Re:Sewage Is Helping Cities Flush Out the Opioid Crisis by empath75 on Tuesday May 29, 2018 @09:22AM (#17178882)
https://en.wikipedia.org/wiki/Rat_Park

Rats that live in interesting, healthy environments don't get addicted to opiates.

Re:Sewage Is Helping Cities Flush Out the Opioid Crisis by JBReefer on Tuesday May 29, 2018 @10:58AM (#17179686)
Rat Park has serious replication problems:

https://news.ycombinator.com/item?id=7743089