What is medium velocity impact spatter in blood impact analysis?

Impact spatters occur when blood is spattered at a velocity that is due to other forces along with gravity to land it away from the body. Medium velocity impact spatters are often caused by blunt force traumas and the spatter droplet size varies up to 4 mm.

How does the velocity of impact change the blood stain pattern?

When blood is impacted, droplets are dispersed through the air. When these droplets strike a surface, the shape of the stain changes depending on the angle of impact, velocity, distance travelled and type of surface impacted. As the angle of impact changes, so does the appearance of the resulting stain.

What affects the shape of blood spatter?

The surface tension of the liquid blood causes the blood drops produced from a blood source to be spherically shaped. Passive drops of blood with changing diameters. The texture of the target surface upon which a drop of blood falls affects the size and shape of the bloodstain pattern.

What creates a projected blood stain?

Projected bloodstains are created when an exposed blood source is subjected to an action or force, greater than the force of gravity. The size, shape, and number of resulting stains will depend, primarily, on the amount of force utilized to strike the blood source.

What is angle of impact in blood spatter?

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 from blood exiting the body under pressure from a breached artery.

What is medium velocity impact spatter?

A medium velocity spatter is a result of a force anywhere from five to a hundred feet per second . This type of splatter can be caused by a blunt force such as a baseball bat or an intense beating. This type of spatter is usually no more than four millimeters. This type of spatter can also be a result of a stabbing.

What is the fastest free falling blood can travel?

Saturation Pattern – Bloodstain pattern resulting from an accumulation liquid on an absorbent material.

How do I know if I have blood spatter?

Analysts or investigators will typically soak up pooled blood, or swab small samples of dried blood in order to determine if it is human blood and then develop a DNA profile. This becomes critical when there are multiple victims.

What two forces act on a falling drop of blood?

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. The blood drop will settle into a spherical shape, as a result of the surface tension.

What shape does a passive drop of blood at a 90 degree angle have?

When a droplet of blood strikes a surface perpendicular (90 degrees) the resulting bloodstain will be circular. Blood that strikes a surface at an angle less than 90 degrees will be elongated or have a tear drop shape.

How far can blood spatter?

Overall, the results indicated that the application of kinetic energy of between 1 and 5J at a height of 1780mm led to the blood droplets travelling a maximum horizontal distance of 5361mm (and average maximum distance of 4981mm).

What causes a low velocity spatter in blood?

Low Velocity Impact Spatter (LVIS)– A bloodstain pattern that is caused by a low velocity impact/force to a blood source. Medium Velocity Impact Spatter (MVIS)– A bloodstain pattern caused by a medium velocity impact/force to a blood source. A beating typically causes this type of spatter.

What causes a medium velocity impact spatter?

Medium Velocity Impact Spatter (MVIS)– A bloodstain pattern caused by a medium velocity impact/force to a blood source.

What kind of force causes medium blood spatter?

Medium Velocity An external force of greater than 5 fps but less than 25 fps causes medium blood spatter. The stains generally measure 1 to 3millimeters.

How does bullet shape and velocity affect blood spatter?

“Our results revealed that bullet shape and velocity determine the blood spatter patterns, because they dictate the velocity field in the blood body,” said Yarin. “When this approach is incorporated into bloodstain pattern analysis in forensics in the future, hopefully it can help crack tough questions.”