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Exam 4 Risk & High Risk Vehicle Stop > SABT 6 H LAB SERVICES & DNA > Flashcards

SABT 6 H LAB SERVICES & DNA Flashcards

0
Q

2 ID types of evidence that can be collected from arson and explosive evidence scenes.

A 
1 Collection of solid scene samples 
2 collection of soil sample 
3 liquid samples 
4 preservation of liquid containers
5 evidence from suspects and victims 
6 incendiary mixtures and devices 
7 molotov cocktails 
8 chemical incendiaries 
9 petroleum products in our environment and the need for control samples
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1
Q

1 List & describe the examination an analyses of forensic that can be performed by the ATF Forensic Laboratory Services.

A
  • Fire Debris
  • explosives
  • Latent Prints
  • FA/ tool marks
  • DNA forensic biology
  • Question documents
  • alcohols
  • tobacco
  • trace evidence
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2
Q

3 Explain methods of collecting, packaging and shipping arson, explosive and bio-hazardous evidence.

A
  • Fire debris and explosive should be package in suitable air tight containers
  • Most other evidence should be placed in containers that breath (boxes , papers, bags)
  • Dry any wet evidence when possible to eliminate bacteria growth
  • LP evidence secured to items are not moving
  • FA render safe, sent magazine, package ammo separately
  • Tool marks protect working surfaces and package tools separately from tool marks.
  • package items separately unless separating them may cause loss ie (hair or fibers)
  • All evidence should be sealed with evidence tape prior to submitting it to the laboratory. Items must be packaged and sealed in a manner which eliminates loss or degradation of the evidence an prevents tampering.
  • Place ur initials an the date over the tape
  • Put a label on each exhibit identifying the number, what it is, location it was recovered
  • Place biohazards labels on anything that may have blood/body fluids on it
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3
Q

Best sample collected on a fire scene are

A. Heavily charred debris
B. Nonporous surfaces
C. Protected from Hear of Fire

A

C. carpet and especially carpet padding, soil, unsealed wood, protected area under furniture behind baseboards

-Worst sample are
Nonporous surfaces, heavily charred debris, samples with contribution from pyrolysis

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4
Q

T/F Dogs are a tool which allow you to select the best sample.

A

True BC dog alerts, does not mean that it was set on fire.

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5
Q

What are the recommended container for collection of debris

A. Paper bag
B. Unused clean metal Can or clean unused glass jars
C. ziplock bag

A

B metal can tight so the vapors can be collected no more than 2/3 full

Glass jars can be used for collection of liquid and solid accelerant evidence

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6
Q

Ignitable liquid are _____ and not _____. Due to marketing practices, the same product may be marketed under a variety of end uses or brand names.
A. Identified/ classified
B Positive ID/ Collected
C. Classified/ Identified

A

C. Classified/ Identified

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7
Q

T/F Fire debris has to be put in a air tight container

A

True,

if not airtight can not analyze

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8
Q

Soil sample degradation within how many hours.
A. 12
B. 40
C. 24

A

C. and refrigerate samples quickly, always collect comparison sample.

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9
Q

ATF Labs do not analyze

A. Drugs and Toxicology
B Fire debris
C. Trace evidence

A

A

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10
Q

T/F Different petroleum companies put markers in gasoline to identify it as their own.

A

True

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11
Q

T/F Liquid to Liquid gasoline comparison can be performed at ATF lab

A

False, can be done but outside of ATF lab

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12
Q

Ignitable liquids are classified as
A. Gasolines, light medium and heavy distillate
B. solvents
C. E-10 gasoline

A

A.

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13
Q

Chemist Duties consist of identifying ____ and ____ of the explosive device.
A. cause, makeup
B. fuzing, firing train
C. specific ID, classification

A

B. Fuzing, and firing train

-also the source information for device components parts, Id explosive main charge,

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14
Q

T/F Jobs of the explosive chemist include comparing items recovered from suspects to evidence from the explosive scene and can also evaluate explosive devices to establish devices signatures.

A

True

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15
Q

Where must the investigator submit incidents of explosives.
A. Crime stoppers.
B. NCIS
C N-Force

A

N-Force

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16
Q

T/F Latent prints can be found on what type of surfaces

Porous and non porous

A

True

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17
Q

Porous items should be packaged in

A. Plastic bags only
B Tin can, glass jar
C. Envelopes, paper, plastic, etc

A

C .

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18
Q

T/F Non porous evidence should be secured to reduce movement during shipping, avoid paper bags if possible.

A

True

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19
Q

What is the name of the database where suspects LP can be ran
A. IAFIS
B. CODIS
C. Crime Stoppers

A

A.

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20
Q

The listed items are from what ____ dept at the ATF Laboratory

  • ID of FA and ammunition
  • function testing
  • IBIS entry
  • ID of tool and tool-marks
  • fracture matching related to FA and tools
  • restoration of obliterated marking/ serial numbers
  • provide technical on scene assistance ( include trajectory analysis and crime scene reconstruction)
  • distance determination based on GSR
A

Firearms and Tool marks

21
Q

T/F Firearms examiners can test fire guns to to compare cartridges form CS to the Cartridge case that were loaded in the firearm.

A

True

22
Q

T/F Firearm examiners can
1 ID if fired bullet was loaded into a certain cartridge case
2 ID if a cartridge came from a particular box or manufacturing lot
3 Perform lead analysis on bullets
4 Determine the order in which the evidence was fired
5 Specify location of bullets
6 Nexus determination

A

False

23
Q

Exams that are completed by ____ in West Virginia
1 Title II determination
2 classification of silencers A. ETB
3 armor piercing classification B. ATF Firearm examiners
4 Antique determination C. FTB

A

C Firearm Technology Branch

24
Q

T/F Can agents sent live ammo through the US mail

A

False sent thru Federal Express

25
Q

Can agents packaged fired Cartridge casing together in one bag?

-Should you mark on the ammunition components?

A

No, package individually

-no

26
Q

What is the name of this

  • The program that uses technology in a cohesive network to provide LEO leads
  • Network of cold case search engines, works toward finding possible matching fire bullets and casing in databases
  • This technology incorporates a database of a firearms ammunition components images
  • One of the most important features of this technology if the ability to AUTOMATICALLY SEARCH LOCAL REGIONAL DATABASE. Upon special request, it is possible to initiate a search of any other database in the nation
A

NIBIN/IBIS National Integrated Ballistic Information Network

27
Q

This is called
A. Search for trace evidence
B. Determine if a tool was used
C. Determine class characteristics
D. determine type, size and design of tool used to create tool-mark
E. type of action the tool employed
F. individual characteristics -Marks the value of comparison purposes
G. If a suspect tool is received we can
1. determine if suspect tool is of the same class of tool which made the tool mark
2. Perform a microscope comparison of toolmark with using a test mark made by suspect tool.
3. Inter-comparisons of tool-marks from different cases and or scenes.

A

Tool Mark Examination and comparisons

28
Q

T/F Can Toolmark examiners ID a particular grinding wheel, file, or saw blade back to a toolmark

A

false they cannot

29
Q 
Examinations of 
1 where the shooter and or target was positioned
2 was the shooter and or target moving 
3 number of shooters 
4 order of shots possibly
A

Trajectory analysis External Technical Assistance

30
Q 
1 Analytic Test 
A shootings trajectory analysis 
B. Ejection pattern testing 
2 Scenario of events to include 
A shooting position 
B Target position 
C. Movements of the shooter and target
A

Shooting reconstruction External Technical Laboratory Assistance

31
Q

Distance Determination

Items needed for testing

A

1 the suspect firearm preferably with magazine
2 The ammunition used in crime, preferably the ammo that was recovered from the scene
3 Target information (eg clothing, house siding, door)
4 information about the environmental condition and possible intervening objects at the scene

32
Q

1 intervening objects will affect the deposition of gunshot residues
2 some materials may inhibit to the deposition of gunshot residues ie. leather
3 Unavailability of the same or similar ammunition
4 Type of firearm unavailable
5 Environmental conditions
6 EMS and or medial examiners
7 improper packaging and handling

A

Factors affecting distance testing

33
Q

T/F Distance determination without the firearm ammunition combination

  • Distance determination with reloaded ammunition
  • Determination of distance from autopsy photographs or victims
  • GSR Identification by instrumental methods i.e on hands or clothing
A

False

34
Q

T/F GSR evidence should be bagged in plastic bag

A

False (airdry, wrap each item separately in paper or place in paper bag, labeled biohazard)

35
Q

What is
1 body fluid identification ( blood, semen, saliva)
2 DNA analysis

A

Forensic biology

36
Q

Chemical substance found in our bodies that is responsible for determining all aspects of our physical makeup blueprint of life
-half from mother and half from the father

A

DNA found in cells of our bodies

(blood, saliva, vaginal fluid, semen, hair root, (with tissue), tooth pulp, bone marrow

37
Q

T/F DNA differ from cell to cell in the same person

A

False,

38
Q

Does DNA differ from person to person?

A

Yes, except for Identical twins

-the majority of all DNA are the same BC we are all human.

39
Q

What part of the DNA is the small portion of DNA that is different, this determines the individual features and is of forensic intrest

A

Junk DNA

40
Q

2 cooperies in each cell inherited from both parents uniques to individual

A

Nuclear

41
Q

forcibly removed root of hair is suitable for ___ or ____ DNA testing

A

-Nuclear

Mitochondrial DNA

42
Q

Suitable for mitochondrial DNA testing only

A

Naturally shed root

43
Q

What four type of gun cases are accepted to laboratory

A
  1. stolen guns
    2 illegal guns
    3 Guns used in violent crimes
    4 Gun trafficking
44
Q

T/F Felon in possession cases can be analyzed for DNA at this time

A

F ( this is due to limited number of DNA analysts, to many felons in possession cases)

45
Q
  • Cannot tell when the DNA sample was deposited on the evidence
  • In a complex/ degraded mixture sample, many individual could be included as contributors.
A

Limitation of DNA evidence

46
Q

This DAN data bank program owned by the FBI which operates on a local, State and National Level.
-Contains several different indexes
1 Forensic Index Solved and unsolved casework DNA profiles,
2 Offender index-DNA profiles from convicted Felons (qualifying offense vary by jurisdiction)
3 arrestee index-DNA profiles from arrested person (qualifying offense by jurisdiction)
-a hit is just investigative information. Involvement of the person with the case must be investigated.
-confirmation sample from the person must be submitted

A

CODIS

47
Q

Handwriting , typewriting, indented writing, impression devices (rubber stamps/ dry seals), photocopies

A

Question documents

48
Q

T/F Handwriting examinations can tell personality, age, sex or handedness of suspect
-Exemplars vs. standard

A

False

49
Q

Paint, glass, fibers, fabric, ropes, cordage, hairs (animal & human), tapes, physical matches, impression evidence (footwear/tire tracks) (soil, adhesives, wood, feathers, leather, bone, matches)
-bloodstain pattern interpretation, digital image comparisons)

A

Trace Evidence

Exam 4 Risk & High Risk Vehicle Stop (21 decks)

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