Void - An absence of stains in an otherwise continuous bloodstain pattern
Pool - Pattern created when a source of blood remains stationary over a surface causing an accumulation of blood
Passive Drop - Droplets of blood created by the force of gravity acting alone; circular in shape
Wipe Pattern - Created when an object moves through an existing stain, removing and/or altering its appearance
Expirated Blood - Blood that is blown out of the nose, mouth or a wound as a result of air pressure and/or air flow as the propelling force; may contain bubbles and/or saliva
Low Velocity Impact Spatter (LVIS) - A pattern created by a low velocity impact to a blood source; fewer, larger droplets
Cast-Off - The pattern created when blood is released or thrown from a blood-bearing object in motion; may produce a curved or straight line made of individual droplets
High Velocity Impact Spatter (HVIS) - A pattern caused by a high velocity impact to a blood source (like from a gunshot); produces a mist/fine spray of droplets
Transfer/Contact Pattern - Created when a wet, bloody surface comes into contact with a second surface, possibly leaving a recognizable image of the original surface
Arterial Spurting - A pattern resulting from blood exiting the body under pressure from a breached artery; large stains with downward flow on vertical surfaces
Swipe Pattern - The transfer of blood from a moving source onto an unstained surface
Medium Velocity Impact Spatter (MVIS) - A pattern created by a medium velocity impact to a blood source (like a beating); droplets smaller than LVIS and more like a spray
Saturation - A pattern created when a volume of blood has been absorbed by an object (like clothing, carpet)
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