Hair + Guns

Front 1

mtDNA

Back 1

-Found in mitochondria

- Matches a family : cant be individualized

Front 2

Follicular tag

Back 2

-Skin cells stuck to the hair

- can help with individualizing

Front 3

Medullary index (MI)

Back 3

Approx fraction of hair filled by medulla

Humans : 1/3

Animals: 1/2

Front 4

Medulla

Back 4

- hair core that is not present (inside later running down center cold cortex)

- some humans have it some don’t

Front 5

Medulla patterns

Back 5

1) straight ————

2) circle ••••••••••

3) squiggle ~~~~~~~~~

Front 6

Hairs are…

Back 6

Trace evidence

Front 7

Hair anatomy

Back 7

Cuticle : outer scaly covering

Cortex : main body

Medulla : core

Front 8

Cortex

Back 8

- Pigment granules

- shape varies, color,‘distribution, density, size

Front 9

Scales

Back 9

- Imbriate (irregularly shaped - no pattern - human)

- Spinous (smoother looking / non human)

- coronal (crown shaped stacked on eachother)

Front 10

Two types of guns

Back 10

1: smooth barrelled (shotgun)

2: rifle barrelled (rifle)

Front 11

Smooth barrelled

Back 11

- shot gun

- old style

- inaccurate: requires shooter to stand very close to target

Front 12

Rifle barrelled

Back 12

- rifle

- new style

- barrel with manufacturers twist or spiraling grooves carved inside

- grooves called rifling

Front 13

Smooth

Back 13

Shotgun

Front 14

Twist and grooves

Back 14

Rifle

Front 15

Determine distance from shooter

Back 15

- identifying gauge of shotgun used

- identifying the specific ammunition used - test firing it to find similar pattern

Front 16

Blowback

Back 16

- pressed against flesh

- flames of shooting out of the gun burn or singe the skin

- casting blood and body tissue back on shooter

Front 17

Star wound

Back 17

- star shaped wound- singeing of flesh caused by violent escape of hot gasses in head

- gases blowback : cause tearing of flesh around wound

Front 18

Stippling

Back 18

- red dots or freckles in flesh area of gunshot wound

-

Front 19

Singeing

Back 19

-flame that emerges from the muzzle, at the time of firing causing burns

Front 20

Physical evidence from shooting

Back 20

Casting : bullet or shotgun

Projectiles : bullets or shot

Front 21

Grooves

Back 21

- class & individual evidence

- contact with rifling creates a series of grooves along side of bullet

Front 22

Striations

Back 22

- features within grooves

- from manufacturer, wear and tear and debris

- considered the “fingerprint” of the gun

Front 23

Firing pin

Back 23

Object that strikes primer surface in base of back of cartridge case

Front 24

marks

Back 24

- projectiles expelled from gun and casting is slammed in opposite directions against back of guns barrel

Front 25

Ejector marks

Back 25

- used castings forcefully spit of of weapon after firing

-contact between ejector and the casing can leave a mark

Front 26

Bullet casing marks

Back 26

1: firing pins

2: breech face

3: ejector mechanism