Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

FSC303 > Fingerprint Identification Part 2 > Flashcards

Fingerprint Identification Part 2 Flashcards

1
Q

What are the two possible sources of a fingerprint deposit?

A

Natural secretions
Foreign materials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the two types of natural secretions that can cause a fingerprint deposit?

A

Eccrine (sweat)
Sebaceous glands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Where are eccrine glands found?

A

All over the body but in greatest density on hands and feet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What controls eccrine glands?

A

Autonomic nervous system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What type of stimuli do eccrine glands respond to?

A

Thermal, emotional or medical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the composition of eccrine glands?

A

98.5 to 99.5% water
1.5 to 0.5 % solids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the main constituents of sebaceous gland secretions?

A

Saturated fats, waxes, squalene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Are sebaceous glands naturally occurring on the hands?

A

No, but secretions can end up there as a result of a migration process

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Give examples of foreign materials that can produce fingerprints.

A

Paint
Automotive lubricants
Dirt
Dust
Industrial grease
Oil
Cooking or food residue
Blood

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the 5 factors that impact fingerprint composition?

A

Rate and duration of sweating
Dietary habits
Age
Physical health and exertion
Stress level

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How does rate and duration of sweating impact fingerprint composition?

A

Excessive and prolonged sweating can dilute the concentration of solids within the sweat.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How do dietary habits impact fingerprint composition?

A

Certain food intake or lack thereof (e.g., salts, fats) influence secretion content. Fluctuates within the individual as well as person to person.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How does age impact fingerprint composition?

A

Concentrations and components within the sweat tends to lessen as we get older.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How can physical health and exertion impact fingerprint composition?

A

Physical health or fitness activities may influence the quantity of sweat therefore relating back to the rate and duration of sweating.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How can stress level impact fingerprint composition?

A

Elevated stress or anxiety levels has been shown to cause a higher concentration of solids in sweat.
Differs from person to person

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Why is stress level particularly important in terms of crime and fingerprints?

A

If someone is making the conscious decision to commit a crime, or actively engaged in the commission of an offence, stress and anxiety levels often increase, resulting in more sweating.

17
Q

Differentiate between the life span and age of a fingerprint.

A

Life span - theoretically how long a fingerprint can survive on a surface
Age - when was the fingerprint deposited?

18
Q

What is the life span of a fingerprint dependent on?

A

Composition of the impression (the person)
The surface
The environment

19
Q

How do we gauge the potential lifespan of a fingerprint?

A

There is currently no known way to accurately gauge this information

20
Q

How do freezing temperatures impact fingerprints?

A

Solidify secretions
Powder adheres to background and fingerprint equally, thus no visible difference

21
Q

How does hot sunny weather impact fingerprints?

A

Causes secretions to bake on the surface as the moisture is quickly evaporated.

22
Q

How does high humidity impact fingerprints?

A

Powder adheres to everything and tends to smear the fingerprint impression and results in contaminating your brush.

23
Q

How can we determine the age of a fingerprint?

A

POS receipt (time stamped)
Witnesses
CCTV and video recording

24
Q

What is the general rule regarding the suitability of surfaces for fingerprints?

A

Fingerprints may be found on any surface with sufficient size and surface continuity to disclose the necessary ridge characteristics in sequence.

25
Q

What are the four factors of surface suitability?

A

Size
Surface continuity
Material
Surface cleanliness

26
Q

How does surface continuity impact surface suitability?

A

Smoothness of an object is a limiting factor in disclosing ridge detail.

27
Q

How does material impact the suitability of a surface?

A

Dictates which development technique is used

28
Q

How does surface cleanliness impact surface suitability?

A

Weigh out the pros/cons of brush contamination, possibility of a take away impression

FSC303 (18 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions