Fingerprinting

Question 1

What percentage of crime scenes will you find fingerprints?

Answer 1

67%

Question 2

of prints found at crime scenes what percentage are identified?

Answer 2

37%

Question 3

how much time does it take to determine if someone is in the AFIS system?

Answer 3

30 min

Question 4

Is NIJ american or canadian

Answer 4

American

Question 5

what is NIJ

Answer 5

national institute of justice

Question 6

what are the 6 classes of fingerprints?

Answer 6

whorl,
right loop,
arch,
tented arch,
left loop,
and double loop

Question 7

how many primary glands contribute to production of sweat?

Answer 7

3

Question 8

what are the glands that contribute to production of sweat?

Answer 8

eccrine
apocrine
sabaceous

Question 9

what compounds are in eccrine glands? how big?

Answer 9

urea, and lactate, small

Question 10

what compounds are in apocrine glands? how big?

Answer 10

proteins and sugars, very large

Question 11

what compounds are in sebaceous glands? how big

Answer 11

fatty acids and triglycerides, relatively small

Question 12

what are proteins made of?

Answer 12

amino acids

Question 13

what are sugars made of

Answer 13

carbohydrates

Question 14

where do the chemicals go from the glands?

Answer 14

from pores to friction ridges

Question 15

a latent print is a ____ of ____ or ____ of the secretions from the three types of glands

Answer 15

mixture of some or all

Question 16

T/F: amount of secretions from glands are the same across all people.

Answer 16

false some people will only deposit some secretions

Question 17

what are the classes of surfaces?

Answer 17

porous and nonporous

Question 18

what does the surface dictate?

Answer 18

the chemistry/reagents used to develop evidence

Question 19

what are nonporous surfaces (general)

Answer 19

do not absorb and repel moisture often appearing polished

Question 20

what are examples of nonporous surfaces?

Answer 20

glass, plastic, metal, ceramic, laminant

Question 21

what are prints on nonporous surfaces more suceptible to?

Answer 21

damage

Question 22

what kind of developer(s) are used for non porous surfaces?

Answer 22

cyanoacrylate (CA)

Question 23

how is cyanoacrylate developed on fingerprints?

Answer 23

fuming in a fumehood/enclosed chamber which will come into contact with the fingerprint and a white polymer grows

Question 24

T/F: butyl-cyanoacrylate can be used to develop prints on non-porous surfaces.

Answer 24

false, ONLY ethyl-cyanoacrylate

Question 25

what is the common name of cyanoacrylate?

Answer 25

superglue

Question 26

what are the issues with cyanoacrylate?

Answer 26

- if substrate is white or transparent a secondary technique will be required - needs chamber and harsh chemicals - not for onsite applications - destructive

Question 27

fingerprints on porous surfaces do what?

Answer 27

absorb into the substrate

Question 28

what are specific examples of porous surfaces?

Answer 28

paper, cardboard, wood

Question 29

what can be used to develop prints on porous surfaces?

Answer 29

ninhydrin, flourescent powders

Question 30

T/F: Ninhydrin reacts with carbohydrates.

Answer 30

false, proteins

Question 31

why is ninhydrin a good developer for porous surfaces?

Answer 31

because amino acids are stationary when absorbed and do not migrate

Question 32

which gland will secrete what ninhydrin develops?

Answer 32

apocrine

Question 33

what is an example of flourescent powders?

Answer 33

1,2-indanedione

Question 34

T/F: ninhydrin is used as a safer, cheaper alternative to develop fingerprints

Answer 34

false, that is 1,2-indanedione

Question 35

why does 1,2-indanedione beat everything else?

Answer 35

because it does not matter the background you put it on

Question 36

what does increased sensitivity mean for LFP development?

Answer 36

you need a dye to help develop

Question 37

what does signal-to noise ratio mean?

Answer 37

signal is the actual fingerprint, should be very very bright compared to the background (noise)

Question 38

what does a bandey score of 0 mean?

Answer 38

abscence of any detail, no development

Question 39

what does a bandey score of 1 mean?

Answer 39

level 1 ridge deteils present, no continuous ridges; they kinda stop abruptly

Question 40

what does a bandey score of 2 mean?

Answer 40

level 2 ridge details are present; 1/3 of the mark comprised of continuous ridges, remainder is no development or spotty

Question 41

what does a bandey score of 3 mean?

Answer 41

level 3 ridge details present; 2/3 of the mark comprised of continuous ridges, remainder is spotty/no development

Question 42

who is the canadian fingerprint expert?

Answer 42

David Ashbaugh

Question 43

what does a bandey score of 4 mean?

Answer 43

"whole shabang" all continuous ridges.