What is the first step in securing and protecting a crime scene?

Identifying the perimeter of the crime scene is a crucial first step in securing and protecting the scene. This action establishes the boundaries within which evidence may be found and helps preserve the integrity of that evidence. By determining the perimeter, investigators can prevent unauthorized individuals from entering the area, which could potentially compromise the scene and hinder the investigation.

Securing the perimeter allows for the systematic collection of evidence and maintains the scene's status until all necessary investigative steps can be completed. It is the foundation upon which the subsequent steps—such as gathering evidence, taking photographs, and interviewing witnesses—are built. Establishing a clear boundary helps in coordinating the response of law enforcement personnel and ensuring that the scene remains undisturbed, which is vital for an accurate investigation.