This Casebook is designed for the “investigations” criminal procedure class commonly taught at American law schools. It focuses on the Fourth, Fifth, and Sixth Amendments to the Constitution of the United States. Fourth Amendment topics include definitions of “search” and “seizure,” probable cause, warrants, exceptions to the warrant requirement (e.g., plain view, consent, automobiles), stop & frisk, and arrests. Moving to interrogations, the book covers due process and the voluntariness requirement, the Miranda Rule, and the Massiah doctrine.