The insistence of multiple states on experimenting with various levels of marijuana decriminalization or legalization raises a host of important and difficult legal questions. To explore these questions, and the emerging landscape of marijuana law and policy, the Center for Business Law & Regulation at the Case Western Reserve University School of Law hosted an interdisciplinary conference on Marijuana, Federal Power & the States in September 2014. The papers from this conference are contained in this issue and address a range of constitutional, regulatory, and policy issues raised by the conflict between federal marijuana prohibition and recent state-level marijuana reforms. The focus of these papers is not whether marijuana should or sh...