Blood Spatter Evidence

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The different kinds of blood spatters

Angle of Impact

the acute angle formed between the direction of a blood drop and the plane of the surface it strikes

Arterial Spurting (or gushing) Pattern

bloodstain pattern(s) resulting form blood exiting the body under pressure from a breached artery

Back Spatter

blood directed back toward the source of energy for force that caused the spatter

Blood Spatter Analysis

a field of forensic science that deals with the physcial properties of blood and the patterns produced under different conditions as a result of various forces applied to the source of the blood

Bloodstain

evidence that liquid blood has come into contact with a surface

Cast-off Pattern

a bloodstain pattern created when blood is released or throw from a moving blood-bearing object

Contact Stain

blood deposited from direct contact between two surfaces, at least one of which is bloody

Direction of Flight

the trajectory of a blood drop, which can be established by it's angle of impact and directionality angle

Directionality

the direstion the blood was traveling when it hit the target surface; investagators can usually establish this if a blood drop's flight from the geometric shape of its bloodstain

Directionality Angle

the angle between the long axis of a bloodstain and a predetermined line on the plane of the target surface that represents 0 degrees

Draw-back Effect

blood in the barrel of a firearm that has been drawn backward into the muzzle

Drip Pattern

a bloodstain pattern that results from blood dripping into blood

Expirated Blood

blood that is blown out of the nose, mouth, or a wound as a result of air pressure or air flow, which is the propelling force

Flight Path

the path of the blood drop as it moves though the space, from the impact site to the target

Flow Pattern

a change in the shape and direction in the bloodstain due to the influence of gravity or movement of the object

Forward Spatter

blood that travels in the same direction as the source of energy or force that caused the spatter

High-velocity Impact Spatter (HVIS)

a bloodstain pattern caused by a highspeed impact or a force to a blood source such as that produced by gunshot; velocity may be 100ft/sec, generally forming drops less than or equal to 1mm

Impact Pattern

bloodstain pattern created when blood recieves a blow or force resulting in the random disperse of smaller drops of blood

Impact Site

the point where force meets a blood source

Low-velocity Impact Spatter (LVIS)

a bloodstain pattern caused by a low-speed impact or force to a blood source; velocity may be up to about 5ft/sec with drop size of 4 to 6mm

Medium-velocity Impact Spatter (MVIS)

a bloodstain pattern caused by a medium-speed impact or force to a blood source; a beating or stabbing typically causes this type of spatter, and velocity may be about 25ft/sec with a stain generally of 1 to 4mm

Misting

blood that has been reduced to a fine spray as a result of the energy or force applied to it

Parent Drop

a drop of blood that casts off a wave or satellite spatter

Passive Drop (bleeding)

bloodstain drop(s) created or formed by the force of gravity acting alone

Point (area) of Convergence

the common point (area), on a two dimensional surface, over which the directionality of several blood drops can be retraced

Point (area) of Origin

the common point (area), in a three dimensional space, to which the trajectories of several blood drops can be replaced

Projected Blood Pattern

a bloodstain pattern produced by blood released under pressure, such as arterial spurting, as opposed to an impact

Satellite Spatter

small droplets of blood distributed around a drop or pool of blood as a result of the blood hitting the target surface

Spatter

blood that has been dispersed as a result of force applied to it's source; the pattern will vary depending on the force that created it

Spine

the pointed or elongated stains that radiate from the central area of a bloodstain

Swipe Pattern

the transfer of blood from a moving source onto an unstained surface; the direction of travel may be determined by the feathered edge

Target

the surface on which blood has been deposited

Transfer or Contact Pattern

a bloodstain pattern created when a wet, bloody surface comes in contact with a second surface; a recognizable image of all or a portion of the original surface may be observed in the pattern

Void

an absence of stains in an otherwise continuous bloodstain pattern, like a reverse shadow

Wipe Pattern

a bloodstain pattern created when an object moves through an existing stain, removing it or changing its appearence

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