What must be recorded in an investigator's notebook according to the guidelines?

The correct answer highlights the importance of including the name of the agency and the case name or number in an investigator's notebook. This information is crucial for establishing a clear and organized record of the investigation, facilitating proper case management and referencing at later stages. By documenting the agency and case identifiers, investigators ensure that their notes can be easily associated with specific assignments, which is vital for accountability and continuity in investigative procedures.

Having these identifiers helps to maintain a structured approach to investigations, allowing for easier retrieval of information when reviewing or discussing cases with colleagues, legal personnel, or during court proceedings. It serves as a fundamental practice to safeguard the integrity of the investigation and provides a clear audit trail that may be required for legal purposes.

In contrast, recording only details relevant to the crime may limit the scope of documentation and affect the overall understanding of the case context. Including an investigator's opinion on evidence is typically discouraged as it introduces subjectivity, which can detract from the objectivity and reliability of the recorded information. Similarly, outlining future strategies for other cases in the current investigation's notebook can create confusion and clutter, detracting from the focus necessary to address the specific case at hand. Thus, the inclusion of the agency name and case number stands out as the most