The "Criminal Procedure Regulation Of Police Legal, Historical, Empirical, and Comparative Materials. Investigation Fifth Edition" is a textbook authored by Christopher Slobogin, focusing on the subject of criminal procedure. This textbook is specifically tailored for students and professionals interested in understanding the rules and regulations surrounding police investigations in a criminal setting. With a clear and informative writing style, readers can expect to gain valuable insights into the complexities of criminal procedure and how it impacts law enforcement practices.