FORENSIC APPLICATIONS OF MICROSCOPY: FIBERS
Step 1 in comparison of synthetic fibers: examination with a comparison microscope.
Pay special attention to the fibers color, diameter, cross-section shape, pitting or striations, and
presence of dulling agents
WHY EXAMINE PHYSICAL EVIDENCE?
Identification elucidating the physical or chemical identity of a substance.
Associative evidence: items of unknown origin until compared to a known standard.
- Comparison: subject evidence and reference material to the same
PHYSICAL AND CHEMICAL PROPERTIES
Properties: distinguishing characteristics that are used to identify different objects
Physical properties: properties that can be observed and recorded without referring to another
- Intensive physical propertie
FORENSIC APPLICATIONS OF MICROSCOPY: HAIR
An individual hair by itself cannot result in definitive identification of a person.
Unless it has a DNA tag attached.
Hair samples can exclude suspects.
Hair is often contributing evidence that connects a suspect