Criminal procedure casebooks densely populate the market but rarely are reviewed. This may be because they are all the same (which makes them unremarkable), or because of the unalterable dominance of Kamisar, LaFave, and Israel's Modern Criminal Procedure (which makes them irrelevant). In Criminal Procedure: Regulation of Police Investigation—Legal, Historical, Empirical, and Comparative Materials, Christopher Slobogin copes with the anxiety of influence by writing a different sort of text. This review essay tracks the book's crowning achievement—the refreshing and inventive "perspectives" chapter that opens the book. The essay then reflects on the few aspects of the chapters on search and seizure, confessions, and remedies that are slightly flawed or incomplete.