fingermarks

Question 1

what are the three purposes of fingermark ridges

Answer 1

1. for friction (grip)
2. to raise up the openings for sweat glands
3. to assist in the sense of touch

Question 2

what are the dips called in between ridges

Answer 2

furrows

Question 3

what are the three different types of fingermark patterns

Answer 3

1. arch
2. whorls
3. loops

Question 4

what are the two key features in fingermark patterns

Answer 4

delta

core

Question 5

on a glass bottle, what two bits pf evidence could there be

Answer 5

1. DNA/saliva found the opening

2. contents such as drug spiking

Question 6

how would you test a glass bottles for fingerprints

Answer 6

aluminium powder and tape lift

superglue fuming and BY40 staining

Question 7

what is the zephyr brush used for

Answer 7

aluminium powder

Question 8

what makes a positive print

Answer 8

seeing the ridge details

Question 9

what makes a negative print

Answer 9

e.g. dust, when the finger lifts off the surface it removes some of the material with it

Question 10

what’s a impression fingermark

Answer 10

on putty or blue tac,

Question 11

Explain how a crime scene mark is compared to a suspect fingerprint to determine if they are a match

Answer 11

they use IDENT1 to access all of the biometric prints in the country
the examiner will be looking for similar patterns and ridge detailing, as well as poroscopy, i.e.

Question 12

what are some porous surfaces

Answer 12

paper
cardboard
wood
plasterboard

Question 13

what are some non porous surfaces

Answer 13

glass
plastic carrier bag
drinks can
bin liners
metal surfaces

Question 14

advantages of DFO

Answer 14

can develop old marks

easy to use

Question 15

disadvantages of DFO

Answer 15

won’t develop fingermarks exposed to water

Question 16

advantages of superglue post treatments

Answer 16

easy to use
use on a wide range of non porous surfaces
size of fuming cupboard allows for large items to be analysed

Question 17

disadvantages of superglue post treatments

Answer 17

requires a specialised chambe to be a fitted with an extraction system

Question 18

what surfaces can protein stains be used on

Answer 18

mostly on non porous stains

Question 19

what protein stains are there?

Answer 19

AB1 AV17 AY7

Question 20

what are the advantages of protein stains

Answer 20

easy to use

cheap

Question 21

how would you test a coke can for fingermarks?

Answer 21

do a visual examination before anything and take photographs
use a carbon black powder, photograph and then do a tape lift
superglue fuming and BY40

Question 22

what other evidence could you find in the coke can

Answer 22

DNA

contents such as drug spiking

Question 23

if blood is on a broken green glass bottle, what tests would you do?

Answer 23

aluminium powder and then a tape lift

superglue fuming and acid black 1

Question 24

what’s the best enhancement strategy for an envelope

Answer 24

photograph and do a visual examination
separate window from the envelope
for plastic window, superglue fuming and BY40

Question 25

what evidence could you find on the envelope

Answer 25

DNA
handwriting
trace evidence in he seal e.g. fibres

Question 26

what are the disadvantages of protein stains

Answer 26

will only stain fingerprints stained with blood or other body fluids
won’t stain fingermarks containing normal constituents of sweat
solvent may damage some surface types

Question 27

what is ACE-V

Answer 27

analysis
comparison
evaluation
verification