This research note explores complications with standard methods to evaluate place-based policing interventions. It identifies and explains issues of boundary misspecification during evaluation as a result of boundary adjustment by police during an intervention.

Medical marijuana laws have been suggested as a possible cause of increases in marijuana use among adolescents in the United States. The study results suggest that, in the states assessed (Montana, Rhode Island, Michigan, and Delaware), medical marijuana laws have not measurably affected adolescent marijuana use in the first few years after their enactment. Longer-term results, after medical marijuana laws are more fully implemented, might be different.

In this Critical Opportunities presentation Michelle Mello, JD, PhD, makes the case that raising the tobacco purchasing age to 21 would aid in reducing minors' tobacco use by 50 percent, which would prevent 10 million people from becoming daily smokers and avoid 3 million premature deaths.