Blood Spatter Types Flashcards

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Questions and Answers

What is the angle of impact?

The angle formed between the direction of a blood drop and the surface it strikes (correct)

The angle at which blood is released from a gunshot wound

The angle formed when blood drops are analyzed

None of the above

What is arterial spurting pattern?

Bloodstain pattern(s) resulting from blood exiting the body under pressure from a breached artery.

What is back spatter?

Blood directed back toward the source of energy or force that caused the spatter.

What does blood spatter analysis involve?

It is a field of forensic science that deals with the physical properties of blood and the patterns produced under various conditions. Signup and view all the answers

What is a bloodstain?

Evidence that liquid blood has come into contact with a surface. Signup and view all the answers

What is a cast-off pattern?

A bloodstain pattern created when blood is released or thrown from a moving blood-bearing object. Signup and view all the answers

What is a contact stain?

Blood deposited from direct contact between two surfaces, at least one of which is bloody. Signup and view all the answers

What does the direction of flight refer to?

The trajectory of a blood drop, established by its angle of impact and directionality angle. Signup and view all the answers

What is directionality in blood spatter analysis?

The direction the blood was traveling when it hit the target surface. Signup and view all the answers

What is the draw-back effect?

Blood in the barrel of a firearm that has been drawn backward into the muzzle. Signup and view all the answers

What creates a drip pattern?

A bloodstain pattern that results from blood dripping into blood. Signup and view all the answers

What is expirated blood?

Blood that is blown out of the nose, mouth, or a wound as a result of air pressure or airflow. Signup and view all the answers

What is a flight path?

The path of the blood drop as it moves through space. Signup and view all the answers

What is the flow pattern in blood spatter?

A change in the shape and direction of a bloodstain due to the influence of gravity or movement of the object. Signup and view all the answers

What is high-velocity impact spatter (HVIS)?

A bloodstain pattern caused by a high-speed impact or force to a blood source, typically producing drops less than or equal to 1mm. Signup and view all the answers

What does low-velocity impact spatter (LVIS) indicate?

A bloodstain pattern caused by a low-speed impact, with drop size up to 4 to 6 mm. Signup and view all the answers

What is misting?

Blood that has been reduced to a fine spray due to the energy or force applied. Signup and view all the answers

What is a parent drop?

A drop of blood that toasts off a wave or satellite spatter. Signup and view all the answers

What creates a passive drop?

A bloodstain drop created or formed by the force of gravity acting alone. Signup and view all the answers

What is the point of convergence?

The common point in a two-dimensional space to which the trajectories of several blood drops can be retraced. Signup and view all the answers

What is the point of origin?

The common point in a three-dimensional space to which the trajectories of several blood drops can be retraced. Signup and view all the answers

What is a projected blood pattern?

A bloodstain pattern produced by blood released under pressure, such as arterial spurting. Signup and view all the answers

What is satellite spatter?

Small droplets of blood distributed around a drop or pool of blood as a result of hitting the target surface. Signup and view all the answers

What is spatter?

Blood that has been dispersed as a result of force. Signup and view all the answers

Study Notes

Blood Spatter Terms and Definitions

Angle of Impact: Acute angle between the blood drop's direction and the surface it strikes.
Arterial Spurting Pattern: Bloodstain patterns arising from a breached artery, resulting in blood exiting under pressure.
Back Spatter: Blood directed back towards the source of the force that caused the spatter.
Blood Spatter Analysis: Forensic science field studying physical properties of blood and the resultant patterns from various forces.
Bloodstain: Evidence of liquid blood contacting a surface.
Cast-off Pattern: Bloodstain pattern created when blood is flung from a moving blood-bearing object.
Contact Stain: Blood deposited from direct contact between two surfaces, at least one being bloody.
Direction of Flight: Trajectory of a blood drop determined by its angle of impact and directionality angle.
Directionality: The orientation of blood while traveling upon impacting a surface, inferred from the stain's geometric shape.
Directionality Angle: Angle between the bloodstain's long axis and a predetermined zero degrees line on the target surface.

Blood Spatter Mechanisms

Draw-back Effect: Blood drawn back into the barrel of a firearm through the muzzle.
Drip Pattern: Bloodstain pattern formed when blood drips into existing blood.
Expirated Blood: Blood expelled from the nose, mouth, or a wound due to air pressure or airflow.
Flight Path: The trajectory of a blood drop from impact site to target surface.
Flow Pattern: Alteration of bloodstain shape and direction due to gravity or movement of an object.
Forward Spatter: Blood traveling in the same direction as the force causing the spatter.

Blood Spatter Classifications

High-Velocity Impact Spatter (HVIS): Resulting from high-speed impacts (e.g., gunshots), with velocity about 100 ft/sec and drops ≤1mm.
Impact Pattern: Bloodstain pattern from a force causing random dispersion of smaller blood drops.
Impact Site: Location where force interacts with a blood source.
Low Velocity Impact Spatter (LVIS): Bloodstain pattern from low-speed impacts, velocity up to 5 ft/sec with drops sized 4-6mm.
Medium Velocity Impact Spatter (MVIS): Pattern from medium-speed impacts, often due to beating/stabbing, at about 25 ft/sec with drops of 1-4mm.

Additional Blood Spatter Insights

Misting: Blood reduced to a fine spray due to applied energy or force.
Parent Drop: Blood drop that gives rise to satellite spatter.
Passive Drop (Bleeding): Bloodstain formed solely by the force of gravity.
Point (Area) of Convergence: 2D common point where trajectories of multiple blood drops can be retraced.
Point (Area) of Origin: 3D common point where blood drop trajectories converge.
Projected Blood Pattern: Bloodstain pattern from blood released under pressure, as seen in arterial spurting.
Satellite Spatter: Small droplets surrounding a blood drop or pool, resulting from the impact on the target surface.
Spatter: Blood dispersed as a result of force dynamics.

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Description

Test your knowledge on various blood spatter types with these flashcards. Each card presents a key term, along with its definition, to enhance your understanding of forensic analysis. Perfect for students and professionals in criminology and forensic science.