Running Head: BLOODSTAIN PATTERN ANALYSIS
Bloodstain Pattern Analysis.
BLOODSTAIN PATTERN ANALYSIS
Bloodstain Pattern Analysis
Blood pattern analysis is a scientific technique used interpret the bloodstain at the scene
of crime with the aim of recreating what could have caused the bloodshed. During blood pattern
analysis, the location is examined to determine the size of the blood, shape and distribution of the
bloodstain. Analyst uses the principles of biology that looks at the behavior of the blood,
mathematical concepts such as geometry, distance and angle and finally the concepts of physics
such as cohesion, velocity and capillary action.
Petechial hemorrhage is a small red mark that appears on the on the eyes and crucial sign
of asphyxia. It is caused by obstructing the body airways externally. Petechial hemorrhage happens
when blood start leaking from small capillaries in the eyes. The capillaries veins raptures when the
pressure in head veins is increased due to the obstruction of the airways leaking blood into the eyes
and the skin. The presence petechial hemorrhage is an indicator the cause of death is asphyxia by
strangling. Petechial hemorrhage in the eyes and the eyelids are a strong indicator of murder by
hanging or strangling.
Sharp force trauma
Sharp force trauma occurs when tissues are separated by a sharp-edged object coming into with
the skin and the underlying tissues. Sharp force trauma exist due to injuries caused through
stabbing, slashing, incising and chopping. Sharp force trauma is caused by sharp objects coming
into contact with skin and tissues causing sharp force injuries to the tissues. The type of injuries
found on victim’s body indicate an attack by sharp-edged objects such as knif...