The first officer arriving at a crime scene, after providing or obtaining medical assistance for the injured and effecting an arrest of suspects (if possible), should immediately:

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The first priority of the first officer arriving at a crime scene is to secure the scene, which means preventing anyone from entering, leaving, or disturbing the scene in any way until detectives and forensic technicians arrive. This helps preserve the integrity of the evidence and ensures the safety of everyone involved. After securing the scene, the officer can provide medical assistance, effect an arrest, take notes, make a rough sketch, and document the scene through photography or video. However, searching for evidence should be left to trained forensic technicians who have the expertise and resources to collect, analyze, and interpret the evidence properly.

The First Officer Arriving at a Crime Scene, After Providing