Forensics Trace Evidence
Lochards’ Exchange Principle - correct answer ✔✔- Every contact makes a trace.
- You cannot leave a room without leaving something behind.
Whenever two objects come into contact with one another, there is exchange of
materials between them.
Techniques to collecting trace evidence? - correct answer ✔✔fingernail scraping,
tape lifts
What are the 2 parts of a hair? - correct answer ✔✔follicle and shaft
hair follicle - correct answer ✔✔club-shaped structure in the dermis (middle layer of
skin)
shaft of hair - correct answer ✔✔the actual hair, made up of the protein keratin
Steps of hair production - correct answer ✔✔1. living cell in hair follicle
2. cell dies and moves from scalp to end of shaft
3. dead cell debris and fragmented DNA is integrated into the shaft
What can younger parts of the hair tell you? - correct answer ✔✔they can be tested
for toxins and drugs to give a timeline
how many layers does the shaft have? - correct answer ✔✔the shaft is made up of 3
layers
what are the three layers of the shaft? - correct answer ✔✔cuticle, cortex, medulla
