The  first responding officer and witness are a very important part of an  investigation. This is because; the first responding officer is the  first to see the scene at its most original state. Likewise, a witness  has important information that would be useful to an officer to start  the process of investigation. Furthermore, officer's actions at the  scene form the basis of the investigation. It's important for the first  responding officer to properly perform their duties. Experience is an  important factor. If a mistake is made by an officer their mishap can  throw the whole investigation off. 
  The duties of the first responding officer include;
1. Assisting the victim and to prevent changes to the victim.
          2. To search for and arrest the suspect if that person is still on the scene.
           3.   To  detain any witnesses to collect information. However, the witness is to  be separated to preserve their objectivity, and the witness is not to  return to the scene if at all possible.
           4.   To protect the crime scene. Begin the crime scene security measures. Example: by the use of barrier tape, official vehicles (Nordby)  etc. Establish a crime scene security log to record any additional  information such as; persons who enter/exit the scene. Do not smoke,  eat, drink within the secured premises and prevent any unnecessary  officials or persons from entering and contaminating the scene.
             5.    All movements, alterations, or changes are to be recorded and communicated with any (Nordby) officials conducting the investigations/ crime scene investigators. 
Works Cited 
Nordby, S. H. (n.d). Forensic Science.
 
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