22- Presence of two wounds inlet and exit 1- Loss of substanceThis 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 .
4DIFFERENCE BETWEEN INLET & EXIT LargeSmallSizeLessMoreLoss of substanceNO++++Powder marksEvertedInvertedEdgeEternalInternalBeveling
5Factor affecting the shape of the FA wound 1- The type of the weapon2- Distance of firing3- Direction of firing.4- Site of the wound5- Type and amount of the powder
6Estimation of the distance of firing: 1- In cases of short distance (near firing):Powder marksII- In cases of long distance (far firing):The estimation of distance is based on the extent of dispersion of shotsIn cases of bullets it is estimated by the amount of penetration
7point blank firing (0-15) The inlet is cross shaped Everted Burnt (flam).Blackening (smoke)Tattooing (unburned particles).
12Medico legal importance of powder marks: 1- Diagnosis of fire arm injuries2- Differentiation between inlet and exit3- Identification the type of powder used4- Estimation the distance of firing5- Determination the direction of firing
13Identification of the weapon used Finger printsSmell of burnt powderType and bore compared with projectile extracted form the victimExperimental examination of the suspected weaponEmpty cartridge at the scene of the crime
14Suicide , homicide or accidental Circumstantial evidenceScene of the crimeExamination of the victimSex - Victims clothes - Cadaveric spasmBlackening of the victim's fingersSigns of resistance
154- Examination of the wound Site of the woundNumber of woundsDistance of firing5 -Examination of the weaponpresence of the weaponType of weapon Short – long6- Examination of the suspected assailant