week 2 Flashcards
(16 cards)
give 3 examples of parameters that can affect the nature of transfer
temperature
duration of transfer/contact
nature of material that is being transferred
what are the three types of primary transfer?
- one way
- two way
- zonal transfer
what is one-way primary transfer?
from A to B e.g fingerprints on glass
what is two-way primary transfer?
from A to B and B to A e.g two people hug, both fibres transfer to each other
what is the forensic opportunity of primary two-way transfer?
supports contact as whats the probability of getting the nature of transfer both ways
what is primary zonal transfer?
where the evidence is located on specific areas/locations that can corroborate a case theory/witness statement
what is secondary/tertiary transfer?
goes from A to B to C
what is an example of a non-contact transfer?
smashed glass or GSR
what is the inverse square law?
transfer is inversely proportional to the square of the distance, further away from an object you are the less likely you’re going to have evidence on you
what does paint transfer depend on?
- nature of contact
- condition of painted surface
what is evidence persistence?
the ability to remain on the site of transfer
give 3 factors that persistence of evidence is dependent on?
- nature of particulates (sharp, rounded)
- size of particulates (small last longer)
- texture of item ( rough, smooth)
what are the 4 methods of recovery for physical evidence?
- hand picking, taping & vacuuming
- tug/shake brush over search cone
3.combing - solvent wash
what evidence is vacuuming used for?
- pollen
-GSR
what evidence is tug/shake/brush used for?
commonly for glass
what evidence can solvent wash be used on?
transfer of paint/inks
