This article investigates the relationship between state-level marijuana policies and drug and alcohol violations in on-campus housing. A review of trends in drug usage precedes discussion of a conceptual framework that can help explain how interactions between college and university student housing and state policy impacts student behavior. Results from cross-sectional mixed-effects models reveal a number of implications for housing professionals, other campus administrators, and policymakers that are discussed along with ideas for future research. [Discussion questions developed by Amelia King-Kostelac.]