There is a US News article[1] that references a study by the AJPH[2]. [1] https://www.usnews.com/news/articles/2016-09-15/study-opioid-use-decreases-in-states-

There is a US News article[1] that references a study by the AJPH[2]. [1] https://www.usnews.com/news/articles/2016-09-15/study-opioid-use-decreases-in-states-that-legalize-medical-marijuana https://www.usnews.com/news/articles/2016-09-15/study-opioid... [2] http://ajph.aphapublications.org/doi/abs/10.2105/AJPH.2016.303426 http://ajph.aphapublications.org/doi/abs/10.2105/AJPH.2016.3...