How is it possible to identify the person who committed a crime??
A little amount of blood or a hair or a fiber or a part of skin or any number of different type of materials can help a crime to be reconstructed and lead investigators to the responsible person.
The goal of a crime-scene investigation is to recognize, document and collect evidence at the scene of a crime.
Solving the crime will then depend on putting together the evidence to form a picture of what happened at the crime-scene.
Investigative Process are to:
👉 Establish that a crime was actually committed,
👉 Identify and apprehend the suspect,
👉 Recover stolen property,
👉 Assist in the prosecution of the person,
Charged with the crime.
WHO IS AN INVESTIGATOR? :
An investigator is one who collects, documents and evaluates evidence and information. The whole process complete through the investigation.
PURPOSE OF INVESTIGATION :
The purpose of criminal investigation and forensic science is to discover the truth behind the scene.
IDENTIFYING, ESTABLISHING, PROTECTING, AND SECURING THE BOUNDARIES :
🔗 The initial Boundary established around the crime scene should be larger than the scene.
🔗 This boundary can easily be shifted inward later but is not as easily enlarged because the surroundings areas may have been contaminated during ensuring interval.
🔗 The responding officer’s must document all actions and observations at the scene as soon as possible.
HOW TO SECURE CRIME SCENE? :
🧤 Naturally, a general rule of protecting the crime scene cannot be applied in every case.
🧤 Who arrive first at crime scene referred as first officer or first responder. The first officer’s top priority to offer assistance for any injured person.
🧤To safeguards evidence and minimize contamination , access to scene must be limited and any persons found at the scene must be identified , documented and then removed from the scene.
🧤 As additional officers arrive, they will begin procedures to isolate the area, using barricades and police tape unauthorized persons from the scene.
The first officer should note the following Points:
1. The overall state and condition of the scene upon arrival.
▪ Doors — open, closed or locked? On which side was the key?
▪ Windows — open or closed? Were they locked?
▪ Lights — on or off? Which lights were on?
▪ Shades, shutters or blinds — open or closed?
▪ Odors — cigarette, smoke, gas, gun powder, perfume, etc.?
▪ Signs of activity — meal preparation, dishes in the sink, house clean or dirty, etc.?
▪ Date and time indicators — mail, newspapers, dates on milk cartons, stopped Clocks, spoiled foods, items that should have been hot or cold but were at room temperature.
2. All personal information concerning witnesses , victims, and suspects.
3. Actions and statements of witnesses, victims and suspects.
4. Moved items condition and their original position (moved item should not be replace on their original position).
5. All physical evidence should be preserved for identification, collection and submission later.
6. After identifying all persons who entered or exited the scene and documenting all the condition investigators establish and safeguards the chain of custody.
DOCUMENTING THE SCENE AND THE EVIDENCE :
Documenting of the crime scene and the evidence involve four major task:
RESPONSIBILITIES OF LEAD INVESTIGATOR :
The lead investigators first task is to evaluate the scene should be processed for physical evidence.
The collection and analysis be processed for physical evidence.
The lead investigator will direct and control the processing. Starting with the recognition of physical evidence.
SYSTEMATICALLY SEARCH FOR EVIDENCE :
COLLECTION AND PRESERVATION OF CRIME SCENE :
Once the discoverer, time of discovery location and appearance of evidence have been thoroughly documented, the evidence must be collected, preserved, inventoried, and packaged in preparation for submission to the forensic lab.
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