Trace Evidence - Hair and Fibers Flashcards
Trace evidence is predominantly
class evidence
will produce ~90 degree angle at distal end of hair
scissor-cut
true or false: hairs decompose
false
hair that is ___ will often curl up, have bubble present, and smell really bad
burnt
dark band that appears near the root of the hair coming from a decomposing body
post-mortem root band
splitting of the distal end of the hear
split ends
true or false: drug use will show in the composition of the hair cuticle, shaft, or medulla
true
crown-like scales; humans rarely have them, but they are common in rodents
coronal scales
presence of ___ helps determine if hair was forcibly removed
hair follicle
this type of root indicates it most likely came from a cat
frayed root
this type of root indicates it most likely came from a dog
spade-shaped
hair that has been damaged via repeated tension or excessive chemical treatments; appears like frayed rope
abraded
petal-like scales; often found in cats
spinous scales
width of the medulla relative to the overall width of the hair
medullary index
study of hair
trichology
area of hair close to scalp
proximal end
true or false: microscopic hair comparison can give conclusive evidence that is absolute personal identification
false; only true if follicle is attached and DNA analysis is carried out
will produce a sharp point on the distal end of hair
razor-cut
hair colored with ___ color systems will produce a smoother transition color pattern
organic
granules that provide the gray color in hair
absent
area of hair nearer to the tip
distal
medulla type with many columns of a repeating pattern; found in rabbits
multiserial ladder
tip indicates the that individual recently had a hair cut
linear/straight
largest portion of the shaft; gives natural hair color
cortex
medullary pattern that can be fragmented, absent, continuous, or interrupted; found in humans
amorphous
medulla type with a singular repeating pattern; found in cats, dogs, rabbits, and rats
uniserial ladder
tip indicates that individual came into close contact with flames/high heat
blackened/frayed
medulla pattern that resembles a disorganized multiserial ladder; boxier than lattice, present in cat and rat
vacuolated
very small physical material that can be transferred from person to person or person and crime scene.
trace evidence
aka “club,” indicates that hair naturally fell out
rounded
this part must be present to conduct DNA analysis from hair
follicle
hair colored with ___ products will often produce stripes
ammonia
true or false: hair itself can be used for DNA analysis
false
central core of the hair
medulla
flattened scales; humans and other animals have this
imbricate scales
true or false: ancestry can be told by hair analysis
true
intricate medullary pattern that does not have a repeating pattern but has interconnected sections; found in deer
lattice
distal tip that usually appears 2+ weeks after a hair cut
rounded tip
famous for saying “when a person comes in contact with another person, place, or object, a cross transfer of evidence occurs”
Locard
hair type that provides the most features for comparison to other hairs
scalp hair; pubic hair is second
