Which responsibility does NOT fall to the assigned investigator at a crime scene?

The responsibility that does not fall to the assigned investigator at a crime scene is related to determining what security is needed at the crime scene. While investigators play a crucial role in the overall management of the investigation, the arrangement and allocation of security measures typically falls to law enforcement personnel responsible for maintaining the integrity of the scene and ensuring that evidence is not compromised.

An investigator is primarily focused on collecting and documenting evidence, interviewing witnesses, and following up on leads to build a case. Their expertise is more centered on the processing of evidence and understanding criminal behavior rather than managing security logistics, which may be handled by a different unit or supervisor within the law enforcement agency. Thus, while security at a crime scene is important, determining what is needed is generally not the responsibility of the investigator.