Module 3 Flashcards
probative value
provides proof of a crime
associative evidence
puts suspect at crime scene but not saying they committed the murder
produce rule
how often is it found in nature
class evidence
group characteristics
-blood type, fibers, paint
individual evidence
narrow down to single source
trace evidence
created when objects come into contact w each other (can be man-made or natural)
- hair, fiber, paint, glass, soil, sand, plant material
Human can determine
human or animal
origin
manner in which removed
treated hair
drugs injested
Part of hair: shaft
sticks out of head
-see
only m-dna (mitochondrial) on moms side
Part of hair: root
lies below epidermis
Part of hair: follicle
hair grows-white bulb
3 types of animal hair
guard hairs: outer coat of animal(protection)
fur hair: inner coat (insulation)
tactile: on head(sensory)
Human Hair types (6)
head: longest
facial: coarse
limb (leg): shorter
fringe: neck. side burns, abdomen
other: chest, underarms(auxiliary)
medulla
outer layer made of keratin and embedded w pigment
melanin:
pigment
cortical fusi
gives curls (air spaces)
anagen
hair growing
catagen
hair at rest
telogen
dying
hair comparison
color, length, diameter, medulla
epidermis
outer layer of skin
subcutaneous tissue
fatty tissue under dermis
dermis
beneath edpidermis
arrector pili muscle
contracts in reaction to cold (connected to every hair)
melanocyte
more: darker hair
less: lighter
produces melanin
Pacinian corpuscle
nerve reaction to pressure
sebaceaous gland
produces oil
sweat gland
produces sweat
