for helpful conversations on this paper. An earlier version of this paper is listed as an NBER working paper (no. 23426). All errors are the authors' responsibility. The corresponding author is Benjamin Cowan. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research. NBER working papers are circulated for discussion and comment purposes. They have not been peer-reviewed or been subject to the review by the NBER Board of Directors that accompanies official NBER publications.

We examine the spillover effects of recreational marijuana legalization (RML) in Colorado and Washington on neighboring states. We find that RML causes a sharp increase in marijuana possession arrests in border counties of neighboring states relative to nonborder counties in these states. RML has no impact on juvenile marijuana possession arrests but is rather fully concentrated among adults. We find mixed results regarding the source(s) of this change. Using separate data on self‐reported marijuana use, we show that RML is accompanied by an increase in use in neighboring states relative to non‐neighboring states. However, the increase in arrests following RML is highly concentrated in a few states, which we argue is more consistent with a change in police enforcement near some state borders driving the arrest results. (JEL I12, I18, K14)

Reported mental health problems have risen dramatically among US college students over time, as has treatment for these problems. We examine the effect of state-level Medicaid expansion following the 2014 implementation of the Affordable Care Act on the diagnosis of mental health conditions, psychotropic prescription drug use, and the mental health status of a national sample of college students. We find that students from disadvantaged backgrounds are more likely to report being on public insurance after 2014 in expansion states relative to non-expansion states, while more advantaged students do not see this increase. Both diagnosis of common mental health conditions and psychotropic drug use increase following expansion for disadvantaged students relative to advantaged ones, which translates into an elimination of the pre-expansion gap in these outcomes by family background in expansion states. However, in contrast to some recent work on Medicaid expansion and mental health, we do not find that these changes are associated with improvements in self-reported mental health status. We also do not find that Medicaid expansion has affected risky health behaviors or academic outcomes.

for their helpful comments. All errors are ours alone. The corresponding author is Benjamin Cowan. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research. NBER working papers are circulated for discussion and comment purposes. They have not been peer-reviewed or been subject to the review by the NBER Board of Directors that accompanies official NBER publications.

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