When should a crime scene investigator arrive at a crime scene?

A crime scene investigator should arrive at a crime scene as soon as possible after the crime is reported to ensure that evidence is collected and preserved effectively. Quick arrival at the scene is crucial because evidence can be time-sensitive and may deteriorate or be contaminated if not handled promptly. Additionally, witness statements may be more reliable when obtained shortly after the incident, as details are fresher in their minds.

Arriving quickly allows the investigator to assess the scene, secure it to prevent tampering, and begin the systematic documentation and collection of physical evidence. This proactive approach is fundamental in building a solid case for prosecution and properly handling the investigation.