The 7 S’s of Crime Scene Investigation (Crime Scene Management)

Introduction

Crime Scene Investigation (CSI) is a systematic process used to preserve, document, collect, and analyze physical evidence from a crime scene. The 7 S’s of Crime Scene Investigation provide a scientific and legal framework to ensure evidence is not contaminated and remains admissible in court.

7 S’s of Crime Scene Investigation

1. Securing the Scene

Securing the crime scene by police to preserve forensic evidence


Securing the crime scene is the responsibility of the first responding police officer (first responder).

Key Points:

● Safety of individuals is the first priority

● Preservation of evidence is the second priority

● Unauthorized persons must be restricted from entering the crime scene

● A security log must be maintained of everyone who enters the scene

● The first responder may call additional expert teams if required

2. Separating the Witnesses

Police separating witnesses during crime scene investigation


Witnesses must be separated immediately after the incident.

Purpose:

● Witnesses are not allowed to talk to each other

● Prevents collusion (creating a false story together)

● Ensures independent and accurate statements

Important Questions Asked from Witnesses:

1. When did the crime occur?

2. Who reported the crime?

3. Who is the victim?

4. Can the perpetrator be identified?

5. What did you see happen?

6. Where were you when you observed the crime?

3. Scanning the Scene

Initial scanning of crime scene by forensic investigators


The forensic examiner performs an initial scan of the crime scene.

Objectives:

● Determine where photographs should be taken

● Identify primary and secondary crime scenes

● Assign priorities for examination

● Get an overall understanding of the scene

4. Seeing the Scene (Photography)

Crime scene photography for proper documentation of evidence


Crime scene photography is a crucial step in documentation.

Photography Rules:

● The crime scene must not be altered

● Objects must remain in their original position until photographed

● Overall, mid-range, and close-up photographs should be taken

● Photos should be taken from different angles and distances

● Triangulation of stationary objects should be included as reference points

● Close-ups of evidence and bodies must be taken

Legal Importance:

● If the crime scene is compromised, evidence may become inadmissible in court

● Any moved or removed evidence must be mentioned in the report

5. Sketching the Scene

Rough sketch of crime scene showing position of evidence and body


After photography, the investigator prepares a rough sketch of the crime scene.

Sketching Guidelines:

● Show accurate position of the body and evidence

● All objects should be measured from two immovable landmarks

● North direction must be labelled

● Scale must be mentioned

● Doors, windows, furniture should be included

● For outdoor scenes, include trees, vehicles, hedges, and structures

Later, a final neat sketch is prepared for court presentation.

6. Searching for Evidence

Grid and spiral search patterns used in crime scene investigation


Investigators must search the crime scene systematically to locate all physical evidence.

Search Patterns Used:

The method depends on the type, size, and location of the crime scene.

(a) Grid Method

● Best for large outdoor scenes (fields)

● Double search pattern

● Investigators move back and forth across the area

(b) Spiral Search Method

● Suitable for large indoor or outdoor scenes with fewer obstacles

● Search starts:

    ○ From center outward, or

    ○ From periphery inward

● Can be conducted by one or two investigators

7. Securing and Collecting Evidence

Collection and packaging of physical evidence at crime scene


All evidence must be handled carefully to maintain its integrity.

Evidence Collection Rules:

● Evidence must be properly packaged, sealed, and labelled

● Liquids are placed in airtight containers

● Moist evidence is air-dried to prevent mould contamination

● Proper techniques for collection and storage must be followed

● Evidence log and chain of custody documents must be attached to the evidence container

Notes (Documentation)

Notes must be taken throughout the crime scene processing.

Notes Should Include:

● Date and time of notification

● Arrival information

● Scene description

● Victim description

● Crime scene team members

● Location of physical evidence

● Time evidence was discovered

● Who discovered it

● How it was collected, packaged, marked, and disposed

Proper notes help in court testimony and case reconstruction.

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