Define a crime scene. Describe the importance of protecting the crime scene and methods police officers and investigators use to protect the crime scene. Identify the methods of recording a crime scene and the proper procedures associated with each method. Identify the responsibilities of the lead investigator in organizing and managing a crime scene. Explain the investigative element of fixed responsibility and the basic guidelines that the investigator must follow. Prepare a crime scene diagram that will refresh the memory of the investigator, including exact location and relationship of pieces of evidence and surroundings. Provide a permanent record of conditions that are otherwise not easily recorded. Assist the prosecutor, judge, and jury with understanding the conditions at a crime scene.