1. CHARACTERS OF FIREARM INJURIES (WOUND)

2. 2- Presence of two wounds inlet and exit
1- Loss of substance
This loss depends on the size of missile, velocity and distance of firing.
2- Presence of two wounds inlet and exit
(grazing of the bullet)
3- Possible presence of associated of projectile (Powder marks)
4- Beveling occurs in flat bones .

4. DIFFERENCE BETWEEN INLET & EXIT
Large
Small
Size
Less
More
Loss of substance NO
++++
Powder marks
Everted
Inverted
Edge
Eternal
Internal
Beveling

5. Factor affecting the shape of the FA wound
1- The type of the weapon
2- Distance of firing
3- Direction of firing.
4- Site of the wound
5- Type and amount of the powder

6. Estimation of the distance of firing:
1- In cases of short distance (near firing):
Powder marks
II- In cases of long distance (far firing):
The estimation of distance is based on the extent of dispersion of shots
In cases of bullets it is estimated by the amount of penetration

7. point blank firing (0-15) The inlet is cross shaped Everted
Burnt (flam).
Blackening (smoke)
Tattooing (unburned particles).

9. In contact firing Burning take the shape of the muzzle,
Minimal blackening and tattooing.
Why

12. Medico legal importance of powder marks:
1- Diagnosis of fire arm injuries
2- Differentiation between inlet and exit
3- Identification the type of powder used
4- Estimation the distance of firing
5- Determination the direction of firing

13. Identification of the weapon used
Finger prints
Smell of burnt powder
Type and bore compared with projectile extracted form the victim
Experimental examination of the suspected weapon
Empty cartridge at the scene of the crime

14. Suicide , homicide or accidental
Circumstantial evidence
Scene of the crime
Examination of the victim
Sex - Victims clothes - Cadaveric spasm
Blackening of the victim's fingers
Signs of resistance

15. 4- Examination of the wound
Site of the wound
Number of wounds
Distance of firing
5 -Examination of the weapon
presence of the weapon
Type of weapon Short – long
6- Examination of the suspected assailant