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What is Forensic Science?
Transcript of What is Forensic Science?
A basic principle of forensics is that a criminal always brings something to a crime scene, but he/she also leaves something behind.
Things "left behind" is evidence detectives look for.
this could be fingerprints, footprints, blood, hair, broken glass, weapons or even wounds left on the victim which indicate nature of weapon or method of assault.
Careful analysis of evidence left behind can be used to determine guity or innocence of a person on trail.
Presence of chemical traces or DNA on a piece of debris is also crucial in establishing the chain of events leading to a crime or accident.
Forensic Science is..
the scientific approach to examining crime scenes
Gathering and examining evidence to be used in legal proceedings
Investigating accidents (ex: train or plane crashes) to establish if it was accidental or intentional and to establish causes of death.
First two steps to preforming an autopsy
the first step is to do visual inspections on the body
the second step is to do a surgical opening of the body for an examination of internal organs in their natural position
Third and forth step
the third step is to dissect some/all organs
the forth and last step is to do laboratory tests of tissue, body fluids and other specimens.
all of this helps to determine cause of death.
samples of tissue (skin, blood, hair) left behind at a crime scene can be compared to DNA of the suspect to help establish if he/she is innocent or guilty.
Fingerprints are one of the main ways to tell who committed the crime.
They examine objects, substances(blood or drug samples), chemicals(explosives, toxins), tissue traces(hair,skin), impressions(fingerprints or tidemarks) left at crime scenes.
What Forensic Scientist do
forensic scientists do this after a person has died in a crime & want to establish cause of death.
They determine this by examining marks on the bone(s), skin(gunshot wounds) and other body surfaces for external trauma.
establish approximate time and cause of death.
Things that show this are cuts, scrapes, punctures and rope marks.
involves collecting a permanent record of the scene
collection of evidence for further examination and comparison
collecting samples including biological(tissue samples such as skin, blood or hair), physical (fingerprints, shells, fragments of instruments or equipment, fibers, recorded voice messages or computer discs) and chemical(samples of paint, cosmetics, slovnets or soil).