Bloodstains are classified into three basic types: passive stains, transfer stains and projected or impact stains. Passive stains include drops, flows and pools, and typically result from gravity acting on an injured body.
- Passive Stains: These occur with indirect forces such as gravity acting on the injured body. ...
- Transfer Stains: These occur by objects or surroundings coming into contact with the blood. ...
- Projected/Impact stains: These occur by the blood that travelled in the air.
What are the types of Blood Stain Patterns?
– Drip Stains/Patterns – blood stain patterns that are created due to the force of gravity acting on liquid blood. – Blood Dripping into Blood – Splashed (Spilled) Blood – Projected Blood (with a syringe) – Transfer Stains/Patterns -A transfer bloodstain pattern is created when a wet, bloody surface contacts a surface that is not bloody.
What are the different blood spatter patterns?
– Spatter Patterns- Blood spatter patterns are created when an exposed blood source is subjected to an action or force greater than gravity (internally or externally) – Castoff- A blood stain pattern that is created when blood is released or thrown from a bloody object in motion.
What are the types of blood spatter?
What are the types of blood spatter?
- Passive. a. formed from the force of gravity acting alone. b. subdivided (drops, drip patterns, pools, clots) c. ...
- Transfer. a. wet bloody surface comes in contact with a secondary surface. b. wipe, smudge, swipe or smear. c.
- Projected blood spatter.
How do you remove old blood stains?
Methods to Remove Old Blood Stain From Clothes
- Using cold water, hydrogen peroxide, and washing detergent approach i). Softly Scrub any clotted blood that is not attached to the fabric firmly. ...
- Using Lemon Rub half a lemon over the old blood stains to dissolve the blood. ...
- Using Baking Soda Prepare a solution of baking soda and water in the ratio 1:2 respectively. ...
What is the most common body fluid of interest in a crime scene?
Is blood a fluid or solid?
What are the three things that can be determined by the analysis of blood spatter?
Blood spatter analysis looks at the size, shape, and direction of bloodstains to determine how the blood impacted the surface, and draws conclusions about how the crime likely occurred.
What are the 4 types of passive bloodstains?
Passive. a. formed from the force of gravity acting alone. b. subdivided (drops, drip patterns, pools, clots) c. oozing or gushes from the body, dripping finger or arm, drops from a knife.Transfer. a. wet bloody surface comes in contact with a secondary surface. b. wipe, smudge, swipe or smear. c. ... Projected blood spatter.
What is the most common bloodstain pattern?
Impact spatter is the most common bloodstain pattern type in a crime scene. It occurs when an object hits a source of blood. In impact blood spatter patterns, blood is often circular and not elongated. There are two types of impact spatter, back spatter and forward spatter.
What are the 4 types of passive bloodstains and how do they differ?
Passive bloodstains are drops created or formed by the force of gravity acting alone. Passive bloodstains can be further subdivided to include drops, drip patterns, pools, and clots.
What are the different types of blood spatter?
Blood spatter is categorized as impact spatter (created when a force is applied to a liquid blood source) or projection spatter (caused by arterial spurting, expirated spray or spatter cast off an object).
What are the 6 patterns 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.
What are three types of blood stains that forensic scientist work with?
Bloodstains are classified into three basic types: passive stains, transfer stains and projected or impact stains.
What is the most common type of bloodstain pattern found at a crime scene?
The most common type of bloodstain pattern found at a crime scene is impact spatter. The pattern occurs when an object impacts the source of the blood. Spatter projected outward and away from the source, such as an exit wound, is called forward spatter.
Which type of blood spatter is most likely to have a tail?
This is bloodstains with evident satellite spatters present. The parent stains will generally be larger stains. The satellite spatter will often have tails that are either connected to the parent stains tails or the tail of the satellite spatter point back in the direction of the parent stain.
What is a drip stain blood?
Drip Stain A bloodstain resulting from a falling drop that formed due to gravity. Drip Trail A bloodstain pattern resulting from the movement of a source of drip stains between two points.
What is a transfer blood stain?
Transfer/Contact bloodstains A transfer or contact stain is produced when an object with blood comes in contact with an object or surface that does not have blood. It may be possible to discern the object that left the blood impression.
What is a passive stain?
Passive Stains: These occur with indirect forces such as gravity acting on the injured body. These can be drops, flows and pools. Transfer Stains: These occur by objects or surroundings coming into contact with the blood.
What are passive bloodstains?
Passive stains include drops, flows and pools, and typically result from gravity acting on an injured body. Transfer stains result from objects coming into contact with existing bloodstains and leaving wipes, swipes or pattern transfers behind such as a bloody shoe print or a smear from a body being dragged.
What are passive blood drops?
Passive dripping, the slow dripping of blood under gravity, is responsible for some bloodstains found at crime scenes, particularly drip trails left by a person moving through the scene.
What are the four phases of impact?
There are four phases of impact: contact and collapse, displacement, dispersion, and retraction.
What shape are passive blood drops?
spherically shapedPassive Bloodstain Patterns. The fluid dynamics of dropping blood are responsible for the stains or patterns produced. The surface tension of the liquid blood causes the blood drops produced from a blood source to be spherically shaped.
What is the most common body fluid of interest in a crime scene?
Blood, bloodstains and bloodstain patterns are undeniably most common body fluid of interest in a crime scene. Composed of water, red blood cells, white blood cells, glucose, proteins, hormones and metabolites, it is one of the most important sources of information about the crime that is being investigated.
Is blood a fluid or solid?
Blood is actually an organ, which is in a fluid form, it is composed of a liquid part and a solid part mixed together, the fluid part is basically composed of plasma and serum and the solid part is composed of proteins, red blood cells, platelets, white blood cells and minerals. Because of its physiologic properties, outside of the body, blood does not stay in its fluid form for a long time and becomes more solid by the time passes (coagulation/clot formation) unless there is a condition of hemophilia or usage of anti-coagulants or blood thinners. The flow of blood differs by the type of the wound, it can drip, spray, flow or ooze and other than the body, blood can drop or splatter from the weapons that were used.
What are the three types of blood stains?
Bloodstains are classified into three basic types: passive stains, transfer stains and projected or impact stains . Passive stains include drops, flows and pools, and typically result from gravity acting on an injured body.
What does a bloodstain on a weapon mean?
As you can see when the assailant goes back and swings the bloodstained weapon it leaves a bloodstain on the wall which indicates the direction the weapon was swung and approximately where the assailant was standing.
What is transfer stains?
Transfer stains result from objects coming into contact with existing bloodstains and leaving wipes, swipes or pattern transfers behind such as a bloody shoe print or a smear from a body being dragged.
What information is obtained from a proper bloodstain pattern analysis?
The following Information may be obtained from a. proper Bloodstain Pattern Analysis: 1. Distance from the blood source to the target. 2. Direction of travel and impact angles. 3. Nature of the force used to cause the bloodshed.
What is bloodstain pattern analysis?
Bloodstain Pattern Analysis: is the examination of the shapes, an interpretation of the physical events that gave rise to their origin. 1. Distance from the blood source to the target. 2. Direction of travel and impact angles. 3. Nature of the force used to cause the bloodshed. 4.
Why does blood form a spherical shape?
The spherical shape is caused by the surface tension of the blood. Surface Tension causes the blood drop to pull itself in; both horizontally and vertically.
When do blood transfers occur?
Transfers occur when a blood source comes in direct contact with a target surface area.
What happens when blood drops settle?
The blood drop will settle into a spherical shape, as a result of the surface tension.
What is the most common body fluid of interest in a crime scene?
Blood, bloodstains and bloodstain patterns are undeniably most common body fluid of interest in a crime scene. Composed of water, red blood cells, white blood cells, glucose, proteins, hormones and metabolites, it is one of the most important sources of information about the crime that is being investigated.
Is blood a fluid or solid?
Blood is actually an organ, which is in a fluid form, it is composed of a liquid part and a solid part mixed together, the fluid part is basically composed of plasma and serum and the solid part is composed of proteins, red blood cells, platelets, white blood cells and minerals. Because of its physiologic properties, outside of the body, blood does not stay in its fluid form for a long time and becomes more solid by the time passes (coagulation/clot formation) unless there is a condition of hemophilia or usage of anti-coagulants or blood thinners. The flow of blood differs by the type of the wound, it can drip, spray, flow or ooze and other than the body, blood can drop or splatter from the weapons that were used.
