Crime Scene Integrity Protection




















We use the SPI initially in order to get an overview and understanding of the crime scene.

Mission: Gather Reliable and ALL the information.

In the questioning method we will use the formula of ‘when did it happen? – what happened?  – who was involved? – how did it happen?’, and we leave the ‘why’ did it happen for the last question.

The reason being, is that, if ”they” were partly responsible then they will use deceptive methods. We then must use deception detection and investigative interviewing to determine the truth of the matter.

SPI: Situation – Position – Implications

Situation: We arrive at the crime scene and need to gather as much usable, reliable and all the information.

Could the crime scene be tampered with by mistake or on purpose, and have we collated all the information from first person and others on the scene?

Position: The crime scene could have been tampered with by someone moving or have stolen items.  Conclusion: the scene has been compromised

Implications: Evidence will not be accepted in the court of law

or if the integrity of the crime scene was contaminated, perhaps orchestrated, caused by mistake or a situation was motivated by insider threat voluntarily or under duress

Gathering usable, reliable and all the information

The first person on the scene forgot to mention to smell of gunpowder and therefore the timeline of the shooting was not recorded and submitted to the investigator.

Interviewing and Investigation of;

  1. Crime Scene” We evaluate by chatting to people and if noticing any reason for concern, we then upgrade to interview to gather all the information
  2. Witnesses: We interview and when we pick up on any deception or identify that the person is hiding something or voluntarily providing more information than we asked for, we then upgrade to investigation (using investigative interviewing techniques)
  3. Suspects require further investigative interviewing techniques to determine why the person may be lying, hiding or sharing information for their own agenda.
  4. Furthermore, we could use the skill-set of deception detection and investigative interviewing to either obtain a confession or to turn the person into being a valuable asset if they are the insider threat working in concert with others.

Crime Scene integrity evaluation and protection [Situation]

Chief Investigator Interviewing first official on the scene: (validate the crime scene perimeter protection)

Questions are repeated from time to time – to evaluate the consistency in the answers

  • When did you arrive on the scene?
  • What did you do first and thereafter?
  • What did you first see?
  • How did you feel?
  • Who was the first person you saw?
  • Let us retrace your steps– walk them back to the entrance of the crime scene.
    Ask them why this is the entrance of the crime scene
  • Tell them to close your eyes and remember if you smelt anything
  • What did you first see? (asking the question again to establish the first perimeter)
  • Ask again: Who was the first person on the scene and who else was here when you arrived? (validating accurate reporting)
  • Did you ask the first person on the scene what they noticed first? (to validate) – Where does the crime scene begin?
  • Why do you think the crime scene begins here? (to confirm)
  • What did you say was touched?
  • What was it that you said was moved?
  • Who else was here when you got here?
  • Ask again: Did you hear any noises?
  • Ask again: What smell was predominant?
  • Ask again: How do you feel now? Confirming their state of mind and if it is inline with the conditions they were in.

Remember we ask the ‘When – what – who – how’ and we leave the Why? at the end


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