What is the first step in crime scene investigation?

Securing the scene to prevent tampering with evidence is indeed the first step in crime scene investigation. This crucial action establishes a controlled environment in which the evidence can be preserved and meticulously examined. It ensures that no unauthorized individuals can alter, remove, or destroy any parts of the scene, maintaining the integrity of the evidence for subsequent analysis.

By securing the scene, investigators can effectively manage the area and allow for proper documentation and collection of evidence later in the investigation process. This foundational step is essential because once evidence is compromised, it can lead to challenges in the investigation and prosecution of a case. Therefore, prioritizing the security of the crime scene protects both the physical evidence and the credibility of the investigation.