Forensic Final Exam Flashcards

1
Q

What are the three timeframes of trauma?

A

Antemortem: evidence of healing; Perimortem: no or little healing but bone exhibits a “green” response; Postmortem: dry rough fracture margins often showing different coloration.

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2
Q

Name three types of trauma

A

Blunt force trauma, sharp force trauma, projectile trauma

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3
Q

Describe blunt force trauma

A

Depression fractures with sharp or defined edges, radiating fractures fall on flat surfaces.

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4
Q

Describe sharp force trauma

A

cut wounds (longer on surface than it is deep), stab wounds (deeper than it is long), defense wounds (typically found on the hands or arms).

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5
Q

Describe beveling for gunshot entrance/exit wounds

A

Entrance wounds will exhibit internal beveling and exit wounds will exhibit external beveling

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6
Q

Describe some different loading forces bones may experience

A

Compression forces (normal for long bones); shear forces (from crushing blows), torsion forces (resulting in spiral fractures), tension and compression together result in butterfly fractures

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7
Q

Sometimes bullets do not actually cause wounds

A

Rather the shockwave of air displacement does

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8
Q

Describe the donated body program of the FAC

A

3 donations per year from 1981-84; 36 per year from 1998-2001; 127 donations in 2009; total of 1,200 individuals in the collection

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9
Q

What information is collected on individuals in the donated body program at the FAC?

A

name, DOB, place of birth, date and COD, sex, ancestry, stature, weight, photographs, hair and eye color, handedness, number of children, blood type, lifelong occupation, medical histories, any tattoos.

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10
Q

What research is conducted at the FAC?

A

general decomposition changes in buried vs. embalmed bodies, decomposition on bullets and bullet types.

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11
Q

Describe Freedman’s Ranch

A

This Texas State Facility houses about 5 acres

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12
Q

How large is the FAC?

A

About 2.3 acres

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13
Q

How is time since death determined

A

Forensic entomology, soil analysis, tissue/fluid analysis, experience, number of leaf falls, body appearance, carnivore activity

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14
Q

What are some factors that affect decomposition?

A

Exposure (inside vs. outside), trauma, blood, clothing (slows decomposition by limiting insect access), surface vs. buried, temperature, scavenger presence

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15
Q

What are some environmental factors that affect decomposition?

A

Temperature, humidity, sunlight vs. shade, covering, insect access.

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16
Q

What are the stages of decomposition?

A

Fresh (autolysis), bloat (putrefaction), decay (putrefaction and carnivores), dry (diagenesis).

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17
Q

What changes occur throughout the stages of decomposition?

A

Early: initial soft tissue changes; Mid: initial skeletonization; Late: bone weathering

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18
Q

Describe 3 blade configurations, 3 blade actions, 2 grip types, and 3 target types from Levi’s lecture

A

blade: standard smooth, serrated, combination; actions: stab, thrust, slash; grip: forward/extended or reverse/ice-pick; targets: systemic, structural, peripheral.

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19
Q

Describe two types of pathology

A

Congenital and acquired

20
Q

What are some categories of acquired pathologies

A

Degenerative processes, dental disease, infectious and inflammatory, metabolic, traumatic, tumors.

21
Q

Name some congenital defects:

A

Cleft palate, dislocations, polydacyly, bifid ribs, spina bifida, spondylosis, dwarfism, scoliosis, cranial suture problems (brachiocephaly, scaphocephaly, anacephaly, craiostenosis).

22
Q

Degenerative disorders may result in

A

the fusion of the vertebrae, fusion of the ribs to the sternum, hip fusion.

23
Q

Name some forms of dental disease

A

caries, dental wear/attrition, tooth loss, tooth abnormalities, supernumerary teeth

24
Q

name two nutritional diseases

A

scurvy, rickets

25
Q

Describe osteoarthritis

A

Probably the most common pathological condition and usually involves the destruction of the hyaline cartilage at joint surfaces and imbalances in mechanical stress which result in pitting, erosion, lipping, and eburnation.

26
Q

What is the context in a forensic field site?

A

Establishing the relationship of human remains to the physical evidence

27
Q

What are some discovery methods used in forensic field sites?

A

systematic pattern search, grid, linear, or spiral searches burial probing and cadaver dogs. Metal detectors, ground penetrating radar, soil resistivity/gradiometer, aerial/infrared photography, LIDAR, gas detectors.

28
Q

In surface scatter documentation a ___ is essential

A

datum

29
Q

What are some criteria used for positive identification?

A

visual, fingerprint, DNA (mt or nuclear DNA), dental radiographs/charts, skeletal radiographs (dental patterns, frontal sinus patterns, past fractures, etc.),

30
Q

What rule requires that scientific standards are applied to forensic data presented in a legal context?

A

Federal Rule 702: the Daubert Rule from Daubert v. Merrell-Dow Pharmaceuticals

31
Q

The first national online repository for missing persons and unidentified dead cases is

A

NamUS (National Missing and Unidentified Persons System); started in 2007

32
Q

NamUS is

A

the first national online repository for missing persons and unidentified dead cases is

33
Q

CODIS is

A

The Combined DNA Index System

34
Q

NCMEC is

A

National Center for Missing and Exploited Children

35
Q

NCIC is

A

National Crime Information Center

36
Q

The FBI chose ___ as the standard to be used in CODIS

A

13 genetic loci

37
Q

Traits: sexing based on the skull

A

Walker: supraorbital margin, supraorbital ridge/glabella, mastoid process, mental eminence, and nuchal crest

38
Q

Traits: sexing based on the pelvis

A

Phenice: greater sciatic notch, pubic width, ischiopubic ramus, ventral arc, preauricular sulcus, raised auricular surface, subpubic concavity

39
Q

Traits: sexing based on long bones

A

Jantz and Spradley

40
Q

Traits: age estimation for the 1) pubic symphysis, 2) auricular surface, and 3) sternal rib ends

A

1) Todd and Suchey Brooks
2) Lovejoy
3) Iscan and Loth

41
Q

Traits: ancestry

A

Hefner and Ousley

42
Q

Traits: stature

A

Fully (anatomical); Trotter and Gleser (regression analysis)

43
Q

Posterior probability

A

Probability of belonging to group, assuming it belongs to one of them.

44
Q

F-typicality

A

Probability of falling within range of variation, considering sampling variation.

45
Q

Chi-typicality

A

Probability of falling within range, ignoring sample variation.

46
Q

R-typicality

A

Explicit rank of skull in each sample.

47
Q

Mahalanobis Distance

A

Measure of similarity of unknown for each group.