What is the definition of cast-off blood?
What is the definition of cast-off blood?
Cast-Off Pattern — A bloodstain pattern created when blood is released or thrown from a blood-bearing object in motion. Directionality — The directionality of a bloodstain or pattern which indicates the direction the blood was traveling when it impacted the target surface.
What can cast-off blood spatter tell us?
Cast-off – results when an object swung in an arc flings blood onto nearby surfaces. This occurs when an assailant swings the bloodstained object back before inflicting another blow. Analysts can tell the direction of the impacting object by the shape of the spatter (tails point in the direction of motion).
What are the 3 different types of blood spatter patterns?
Bloodstains are classified into three basic types: passive stains, transfer stains and projected or impact stains.
What is a cast-off stain?
Cast-off stains are a specific form of bloodstain pattern which involves energy being indirectly imparted to a mass of blood through the movement of an object.
What is a parent stain?
Parent Stain. A bloodstain from which a satellite stain originated. Perimeter Stain. An altered bloodstain which consists of its edge characteristics, the central area having been partially or entirely removed.
What does the tail of a blood drop tell you?
The “tail” or wave castoff of the bloodstain generally points to the direction of travel of the blood drop. The direction of travel and the angle of impact are referred to as the directionality of a bloodstain pattern. The directionality of a bloodstain will be used for reconstructing where the bloodshed occurred.
What is cast of spatter?
Cast-off spatters often occur during crimes involving beating events. In the context of bloodstain pattern analysis, a cast-off spatter pattern is defined as “a bloodstain pattern resulting from blood drops released from an object due to its motion” [1].
How do you analyze blood stains?
Bloodstain Pattern Analysis
- Where did the blood come from?
- What caused the wounds?
- From what direction was the victim wounded?
- How were the victim(s) and perpetrator(s) positioned?
- What movements were made after the bloodshed?
- How many potential perpetrators were present?
What are the 6 types of blood spatter?
There are seven bloodstain categories: (1) passive bloodstain; (2) projected bloodstains; (3) impact spatter; (4) cast-off bloodstains; (5) arterial gush or spurt bloodstains; (6) wipe bloodstain patterns; and (7) transfer bloodstains.
How do you identify blood stains?
Luminol is often combined with hydrogen peroxide to react with the heme groups in blood, producing a bright blue glow, known as chemiluminescence. This glow allows crime scene technicians to detect blood that has dried on surfaces or to detect blood that someone tried to clean from a surface.
What is wet blood stain?
Spatter Stain – A bloodstain resulting from a blood drop dispersed through the air due to an external force applied to a source of liquid blood.
What are passive blood drops?
Passive drops are drops of blood that are formed under the influence of only gravity. This is often observed in incidents involving moving injured persons. Pool pattern. A pool pattern forms when blood has flowed in one place for some time, such as when a bleeding victim stayed there for a period of time.