Which action is necessary before collecting evidence at a crime scene?

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Establishing a perimeter is crucial before collecting evidence at a crime scene because it helps ensure the integrity of the scene. By creating a boundary, investigators can restrict access to the area, which protects it from contamination or alteration by unauthorized individuals. This step is vital for preserving the evidence for examination and potential presentation in court. A well-defined perimeter allows for better organization of the investigation and ensures that all evidence collected remains valid and legally admissible.

In contrast, while interviewing witnesses, documenting the scene, and obtaining consent are important components of the overall investigation process, they typically occur after securing the crime scene. First and foremost, establishing a perimeter helps maintain the scene’s condition, which is critical for effective evidence collection.

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