The provided text offers a comprehensive overview of criminal investigation principles, emphasizing the legal gathering of evidence and the structured approach to crime scene management. It defines key legal terms relevant to investigations, details the tools and goals of a criminal investigator, and outlines the characteristics essential for effective investigative work. The text further explains the five stages of a preliminary investigation, covering everything from securing the scene and processing evidence through photography and sketching, to the collection and preservation of various types of evidence while maintaining a strict chain of custody. Finally, it underscores the importance of case management for successful prosecution.

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