Evidence?!?!
The information provided that shows something as being "True" or "valid"
Glass, Hair, Prints, etc.
Strands of natural materials
Crime Scene Investigator
True or false,
Hair isn't that important in a crime scene
False
What is this?
Fingerprints
What does a forensic biologist do?
Someone who reviews the marks left by a suspect to determine its origin.
Name one of the types of fibres?
Human hair, Cotton, Wool, Synthetic
What is one role of the uniformed officer when they arrive on the crime scene?
Evacuate, Isolate, Don't contaminate (EIDC)
The trace elements within someone's hair are ALWAYS the same
False, Everyone has unique trace elements within their hair based on their diet, environment.
What is this?
What is the Chain of Possession?
Transferring evidence to different investigators to ensure that no one tampers with the materials.
Microscopes
True or false,
Chemists, biologists are always at the crime scene to analyse evidence
False
The cross - section and shape of the hair follicles present
What is this?
Nothing at the scene but at the lab, they look at the chemical components of the drugs to determine the manufacturer, quality, purity etc.
What is the difference between Cotton and Hair in the fibre structure?
Cotton = Rough Surface with altering thickness
Hair = Overlapping scales (Rough + Scaly surface)
Why do CSI officers use a ruler when taking photos?
To take measurements of someone's unique prints based on the size of a person.
How can we determine what animal corresponds to a specific hair?
Look at the pattern of overlapping scales
Why do we need evidence?
Helps us determine the suspect for a crime.
What is the role of a Toxicologist?
True or false,
Fibres are considered "True evidence" when analysing a crime scene
False,
These are forms of "Circumstantial Evidence" because they don't provide definitive proof that the suspect committed a crime.
What is an entomologist?
An entomologist is someone who studies insercts. In the case of the crime scene, they analyse maggots to determine how long the body may have potentially been decomposing/dead for.
Name the three layers of the hair:
- Central core: Medulla
- Coloured Layer: Cortex
- Outer layer: Cuticle