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PHYSICAL EVIDENCE

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by

Michelle Li

on 26 September 2014

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Transcript of PHYSICAL EVIDENCE

CSI: PHYSICAL EVIDENCE
Trace Evidence
Small amounts of evidence collected at a crime scene
Came into contact with a suspect and can be "traced" back to them
Important in recreating a scene so it can be analyzed later
Examples include: fingerprints, strands of hair, fibers, gun shot residue, and foot or hand prints.
Fingerprints, shoe prints, bite marks, tire tracks, and tool marks.
Created when an object leaves a mark on another object.
Introduction to
Criminal Scene Investigation
Types of Evidence
Testimonial Evidence
This is proof of what might happened by people who were there. They tell the police what they saw or heard.

i.e "Mr. Finch told the police he saw Ms. Pilkinton steal the documents"
Physical Evidence
It is the materials that are found on the victim, on the suspects, and at the crime scene.

i.e. Police found the suspect, Mr.Cunningham, in possession of a gun similar to the one found on the crime scene.
Hair And Fibers
Weapons and Firearms
Questioned Documents
By Delia, Abbygail, Laura, Micaela, Danielle, and Michelle.
What?
Who?
Where?
When?
Why?
How?
Wherever a crime happened
It protects us and prevents other crimes.
C
S
I
Works Cited
Found at the crime scene, on victims, and on suspects
Used to determine suspects

Victim(s), suspects, police officers, detectives, forensic specialists, and witnesses
Whenever a crime is committed and the criminals must be discovered.
Body Fluids
Contain information about who it belongs to.
Saliva is needed to taste, fight bad germs and keep our mouth moist.
Blood is the red liquid going around in our bodies to keep us alive.
There are 8 blood types:
O+, O-, A+, A-, B+, B-, AB+, AB-.
Body fluid found on scene will match the body fluid of the criminal.
Victim's body fluids might have gotten on criminal, or vice versa.

camipnig knives?
An investigation of a crime to figure out who did it and how it happened.
Any type of rifle, pistol or any other type of portable weapon
Used to cause bodily or physical harm
Can be examined for any fingerprints
Bullets can normally be traced back to a gun and hopefully a suspect
finger/hand prints
Hair Fibers in Clothing
Gun Shot Residue
Investigators collect evidence to prove who did it, why they did it, and how it happened.
Look for the colour, texture, and thickness
Made of the cuticle, the cortex and the medulla.
It is like a pencil
The paint is the cuticle
The wood is the cortex
The lead inside is the medulla
Smallest unit of a textile material
Transfer of the victim's clothing and the suspects clothing.
There are two main groups of fibers:
Natural(i.e. cotton)
Man-made(i.e Nylon).
Hair
Fibres
Impressions
Visible prints - can be seen to the naked eye.
Moulded prints - a mark left in a soft material like play dough or soap.
Latent prints - natural oils on a smooth surface, not visible to eye.
Special tools to see latent fingerprints
One technique is to use powder and tape
Everyone’s fingerprint is different and unique, even for twins.
Helps find suspects or help police cross some of the suspects off the list.
Bills, receipts, proof of purchase, telephone records, and little notes.
Show proof of an action that was done,
Check with phone companies, look at a persons credit card, or GPS history.
A paper trail is a record of a person's affairs through recording their transactions.
Find out about where, when, why, and how a person did something
Lead to real evidence and help solve crimes
http://www.blood.ca/CentreApps/Internet/UW_V502_MainEngine.nsf/page/Blood+Type+Facts?OpenDocument&CloseMenu

http://www.forensic-medecine.info/fingerprints.html

http://sciencespot.net/Pages/classforsci.html

http://www.blood.ca/CentreApps/Internet/UW_V502_MainEngine.nsf/page/Blood+Type+Facts?OpenDocument&CloseMenu

http://www.crime-scene-investigator.net/CAfirearms.pdf

http://science.howstuffworks.com/csi4.htm

http://forensics4fiction.com/2012/01/29/defining-trace-evidence/

http://definitions.uslegal.com/t/trace-evidence/

 http://www.crimemuseum.org/blog/question
Full transcript