FINAL

Question 1

7 S’s of Crime Scene Investigation

Answer 1

1. SECURING the crime scene
2. SEPARATING the witnesses
3. SCANNING the crime scene
4. SEEING the crime scene
5. SKETCHING the crime scene
6. SEARCHING the crime scene
7. SECURING and collecting evid

Question 2

Securing the crime scene

Answer 2

Protects and preserves the crime scene (job of first responder)

Question 3

Separating the witnesses

Answer 3

Prevents collusion and possible contamination of direct evid

Question 4

Scanning the crime scene

Answer 4

Evaluate where pictures should be taken and determine general borders of the crime scene; evaluate for secondary crime scene

Question 5

Seeing the crime scene

Answer 5

Take pictures from all angles- triangulation

Question 6

Sketching the crime scene

Answer 6

Should be to scale
Notes possible positions of remains
Note other evid found at scene

Question 7

Searching the crime scene for evid

Answer 7

Search methods should vary depending on size of crime scene

Evid is photographed and labeled

Question 8

Securing and collecting evid

Answer 8

Evid should be packaged, sealed, catalogued.. chain of custody

Question 9

2 types of search patterns

Answer 9

Linear and Spiral (?)

Question 10

5 Patterns of the Medulla (know 2)

Answer 10

Hollow
Absent
Fragmented
Segmental
Solid

Question 11

Locard’s principal of exchange

Answer 11

When a person comes into contact wiht an object or anotehr person, a cross transfer of physical evidence can occur- extent of transfer depends on intensity, duration, and nature of the contact

Question 12

2 Methods plants use for pollination

Answer 12

Wind

Animals

Question 13

3 Fingerprint patterns

Answer 13

Be able to recognize Loop Whorl and Arch

Question 14

3 Types of fingerprints

Answer 14

Patent- visible pattern left on a smooth surface when fingers coated with blood, ink or some other substance touch a surface and transfer their print
Plastic- 3D fingerprint made in soft material such as clay, soap or putty
Latent- concealed fingerprints made visible thought use of powders or forensic techniques

Question 15

4 components of blood

Answer 15

Plasma- 35% of total blood volume
Platelets- cause blood to clot
Red Blood Cells
White Blood Cells- only part that has DNA

Question 16

What do white blood cells contain to make it used for DNA profiling?

Answer 16

DNA….

Question 17

Antigens

Answer 17

Substance that provokes an immune response in the body

Question 18

5 of population with A,B,AB,O blood types

Answer 18

A- 42%
B- 12%
AB- 3%
O- 43%
Rh+ 85%
Rh- 15%

Question 19

Trail of circular blood drops indicates what?

Answer 19

Passive- either standing still, or if moving, moving very slowly

Question 20

Types of blood spatter (be able to recognize)

Answer 20

Wipe- object moves through partially dried blood
Swipe- Something wet with blood brushes against surface (feathered edge indicates direction)
Arterial Gush- blood exits the body under pressure from artery- peaks from heart contraction
Expired Blood- blood blown out of mouth/nose as result of air pressure (has bubbles)
Shadowing/Void- absence of blood in a pattern

Question 21

3 factors determining toxicity of toxin

Answer 21

Dose
Duration
Nature of exposure
Interactions w/ other meds
By-products (ex wood alcohol)

Question 22

When document is questioned, it is compared with what?

Answer 22

Exemplar

Question 23

12 Characteristics of handwriting- know 4 (or 5)

Answer 23

1. Line Quality
2. Spacing
3. Size consistency
4. Pen Pressure
5. Connecting letters

Question 24

T/F: When suspect is creating a writing sample, the officer should let them know what it is being used for

Answer 24

FALSE

Question 25

What are the 3 things that Biometric Signature Pads measure?

Answer 25

1. Speed 2. Pressure 3. Angles NOT RHYTHM

Question 26

Is handwriting analysis by experts enough for a conviction?

Answer 26

NO

Question 27

5 places where blowflies lay their eggs (besides in wounds)

Answer 27

``` Mouth Nose Ear Vagina Anus ```

Question 28

Factors that affect the growth of the blowfly

Answer 28

Body clothed? Body wrapped, frozen or inaccesible to insects? Body burned? Environment Body exposed to wind, sun, shade? Body exposed to toxins that affect growth rate? Adequate food source for insects?

Question 29

4 categories for manner of death that ME can determine

Answer 29

Natural Accidental Suicidal Homicidal

Question 30

When does Rigor Mortis peak?

Answer 30

12 hrs

Question 31

At what point does coloration of skin from livor mortis become permanent?

Answer 31

8 hrs

Question 32

What does a body look like 2 months after death?

Answer 32

Soft tissue mostly gone Odors largely gone Bones remain

Question 33

4 rules of thumb determining how long the person has been dead

Answer 33

Body warm and limp- dead less than 3 hours Body warm and stiff- dead 3-8 hours Body cold and stiff- dead 8-36 hours Body cold and limp- dead more than 36 hours

Question 34

3 soil textures

Answer 34

Sand Silt Clay

Question 35

Cadaver Decomposition Island

Answer 35

Area where the soil has been disturbed (from burying a body)- recognized by upturned soil and differentiation of plant life

Question 36

4 components of cartridge

Answer 36

Primer powder Gun powder Bullet Metal casing that holds it together

Question 37

How does a gun work?

Answer 37

Trigger breaks and sends firing pin forward, firing pen strikes primer which initiates a controlled explosion, sending the bullet flying down the barrel

Question 38

What causes rifling?

Answer 38

Elevation and lands in barrel of gun

Question 39

What are the different ways to identify cartridge from a gun

Answer 39

Breach block mark Primer strike marks Ejection marks

Question 40

T/F: Gunshot residue mark is left on the cartridge

Answer 40

FALSE

Question 41

3 things to be learned about subject from shoe/foot impressions

Answer 41

``` Whether person walks on toes or heels Body weight If person tends to walk with toes pointed in/outward Shape of foot and wearer's activities Unique marks or holes ```

Question 42

3 measurements taken from tire impressions

Answer 42

Turning Radius Track width of front and back Wheelbase (distance between tires)