I’m so pleased to introduce guest blogger Professor Eric Miller, from St. Louis University School of Law. His scholarship focuses on policing, race, and drug enforcement–key issues in the informant policy world. Readers may be particularly interested in this piece: Role-Based Policing: Restraining Police Conduct “Outside the Legitimate Investigative Sphere,” 94 Cal. L. Rev. 617 (2006), in which Professor Miller thinks about the many informal ways that police interact with suspects and citizens. He’ll be with us for October.