Which characteristic is NOT relevant when interviewing witnesses?

When conducting interviews with witnesses, it is crucial to focus on information that may directly impact the investigation. The witness's emotional state, while it may affect their ability to recall details or cooperate, does not provide substantive information relevant to the facts of the crime itself.

Understanding the time of the crime is essential for establishing a timeline and correlating witness accounts with other evidence. Knowing the type of weapon used can help investigators understand the nature of the crime and its potential motive, while the type of individuals victimized can offer insights into patterns or motives of criminal activity. All these factors contribute directly to the case.

The emotional state of the witness, however, primarily pertains to their personal reaction to the crime rather than factual details about what occurred. Thus, it is not a characteristic that adds value to the investigation from an evidentiary perspective.