Criminal Procedure: Investigation and Right to Counsel is for courses on criminal procedure law that focus on the issues pertaining to the investigation of criminal activities. It is a spin-off of Comprehensive Criminal Procedure, by the same team of authors, which covers both the investigatory and adjudicatory aspects of criminal procedure law. The casebook focuses primarily on constitutional criminal procedure law, but also covers relevant statutes and court rules. The casebook is deliberately challenging it is designed for teachers who want to explore deeply not only the contemporary state of the law, but also its historical and theoretical foundations. The casebook incorporates a particular emphasis on empirical knowledge about the real-world impacts of law-in-action; the significance of race and class; the close relationship between criminal procedure law and substantive criminal law; the cold reality that hard choices sometimes must be made in a world of limited criminal justice resources; and, finally, the recognition that criminal procedure law always should strive to achieve both fairness to the accused and justice for society as a whole.