What is the first person who arrives at the crime scene known as?

First Responder

Explanation:

The first person that arrives at the crime scene is known as first responder. A first responder is a trained personnel that responds or arrives first at the crime scene. The duty of a first responder is to protect the people and the crime scene and also to regulate the changes that affected the crime scene.

its a responder.

Explanation:

they are the first to report to any type of scene

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