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forensic investigation

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nada alzahrani

on 20 May 2014

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Transcript of forensic investigation

Forensic Specialist
1) Forensic Chemistry
2- Forensic Anthropology

3- Criminalistics
4- Forensic Engineering
5-Forensic Odontology
6- Forensic Pathology
and Biology
Forensic chemistry is the study of:
Fingerprint patterns
Poisons and Drugs.
9- Forensic Serology
The forensic serology depends on:
Human Blood
Body Fluids
Which in this case many violent crimes such as rape and murders, the most valuable type of evidence will probably be blood.
8- Forensic Toxicology
Toxicology is analyzing and interpretation of the body:

Toxicology forensic science applies this analytical condition that may be cause of death or injury by ingestion of drugs or toxins.
7- Psychiatry and Behavioral Science

determining whether a person is mentally
competent to stand trial and assist in his own defense.
deals with skeletal biology which consist of bone system structures and bone and their relationships to characteristics such as race, gender, socioeconomic status, age, and so forth.

it has the largest membership in the (AAFS), It can be defined as the application of scientific procedure to the recognition, collection, identification, and comparison of physical evidence that generated by criminal or illegal civil activity
it has concept uses of civil, chemical, mechanical, and electrical engineering as tools in the reconstruction of crimes and accidents and the determine their cause.
it is one of the longest and most significant methods to identify the body of its teeth and only reliable method to determine the human remains in collective of disasters

forensic pathology determining the manner and cause of death.
biological sciences that have important applications in forensics, including entomology in forensic medicine
All of this in
how can reveal the secrets of the mysterious crimes ?
what is forensic ?
what is CSI?
CSI helps detector in their investigation , they collect all visible and non visible samples that available in crime scene to use those samples as evidence which could lead them to solve the crimes.

forensic investigation
Nada Al Zahranni
Fadwa AL sayied
Sarah Khaled
Aiyshah Al Zahrani
Aya Al sheikah
Bayan Al Garni
Hadeel Al Shangiti
lamia Al Ghamdi
Fatimah Al Olagi
supervised by
Dr. Sanaa Tork
Done by
if there any crime happen
Forensic scientists will examine material evidence from the crime scene and victim to provide scientific evidence to assist in the investigation and court proceedings
The application of scientific knowledge and methodology to legal problems and criminal investigation
forensic is
All detective must secure the crime scene
to preserve the crime scene as it was
to prevent unauthorized person to enter and take or play in evidence and change it
keep the pertinent evidence uncontaminated
until it can be recorded and collected
crime scene could be indoor or outdoor
it surrounded by warning label
processing crime scene
preserve evidences
all physical evidences should be preserve and packaging to prevent breakage, spoilage, or contamination that will destroy its value.
collecting evidence
search for evidences
Search in crime scene is a process that aims to collecting all evidence Potential to the solution of the case
Documentation is the Creation of a detailed, complete record of a crime scene,
1. Reports and note-taking
2. Photography
3. Videography
4. Crime scene sketching and mapping
Notes are any type of documenting for anything that cannot be photographed, sketched, or video recorded. Videotaping
it is mainly concerned with recording details of a crime scene.
It is useful method of providing visual documentation of the conditions and items encountered at the crime scene
crime scene sketch is a permanent record of the size and remote relationship of the crime scene and the physical evidence within it.
Depending on the location or the type of crime, the investigator may choose one of the following five basic patterns for searching a crime scene
Pie or Wheel
The most fragile evidence such as fingerprints should have first priority to collect . After fingerprints, other fragile evidence such as blood and trace evidence is collected
Sources of Trace Evidence

Evidence from the Body

Kind OF Evidences In Crime Scene
Physical Evidence

Physical evidence can take any form. It can be as large as a house or as small as a fiber.

Several different parts of the body such as palms, fingers, toes and the soles of the feet have friction ridges that can for a "fingerprint” ,


Hair evidence can be obtained from the victim, the suspect, a crime scene, or from other evidence such as clothing

Biological fluids such as blood, semen, and saliva
Mark the packaging with a “BIOHAZARD” label.
biological evidence
Rules of storing biological evidence are to refrigerate liquid evidence and freeze wet evidence, dry biological evidence can be maintained at controlled room temperature.
preserve evidence

evidences packaged in Paper bags or envelopes, Plastic bags or Ziplocs, Metal cans, Plastic buckets ..etc
The type they choose depends on the type of evidence, the condition of the evidence, and the examination(s) they want the laboratory to perform.

Ensures that it’s a proper sealing , tamper-proof and date across the seal because the laboratory cannot accept evidence that is not sealed

All evidence collected should be tagged. If the item cannot be tagged then it should be labeled or marked.

The outer packaging must be labeled with at least the following:
Agency case number
Evidence/item number
Initials of the person collecting the evidence
Any evidence sealed incorrectly will be returned to the submitting agency
Do not use ink that will blur or run when labeling evidence
Laboratory Submission:

There is a form called “evidence submission request form” For evidence items that are to be submitted to a forensic laboratory .
The form generally contains:
case information,
date and time of incident,
name(s) of victim(s) and suspect(s),
type of incident,
name and contact information for the submitting agency and investigator(s), and a list of items submitted.
After the completion of all the previous steps
send the evidences to the forensic laboratory for final examination and analysis
when evidence arrive to laboratory, it processed by
For the law enforcement

they take the evidence and searches on CODIS,NDIS and AFIS
(Combined DNA Index system) ,is a Databank that contain DNA profiles of convicted criminals, missing people, and/or profiles from evidence from cases with no suspects has been identified.
it's an useful way for providing investigative tools for solving many crimes
is the highest level in the CODIS hierarchy , and enable the laboratories participating in the CODIS program to exchange and compare DNA profiles on a National level.

National DNA Index System
contains the largest Biometric database in the world, Maintain the fingerprints and criminal information history for more than 47 million subjects.
The fingerprints and corresponding criminal history information are submitted voluntarily by state, local, and federal law enforcement agencies
from all our hearts
Thank you so much for listening
Big Thanks for our supervisor
Dr. Sanaa Tork
Thanks for the Doctors who attended our presentation
Big thanks for my group

designated by Nada Alzahrani
Full transcript