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

Evidence that liquid blood has come into contact with a surface.

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

Rings in blood that result when blood containing air dries and retains the circular configuration as a dried outline.

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

A bloodstain or pattern which indicates the direction of the blood was traveling when it impacted the target surface.

The trajectory of a blood drop which can be established by its angles of impact.

Bloodstain patterns resulting from blood exiting the body under pressure from a breached artery.

The angle between the long axis of a blood stain and a predetermined line on the plane of the target surface which represents 0 degrees.

A blood stain pattern which results from blood dripping into blood.

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

The path of the blood drop, as it moves through space, from the impact site to the target.

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

Blood which travels in the same direction as the source of energy or fore which caused the spatter.

A bloodstain pattern caused by a high velocity impact or force.

Bloodstain pattern created when blood receives a blow or force resulting in the random dispersion of small drips of blood.

That point where force encounters a source of blood.

A bloodstain pattern caused by a medium velocity impact to a blood source.

Blood which has been reduced to a fine spray, as a result of the energy or force applied to it.

A drop of blood from which a wave, cast-off, or satellite spatter.

A bloodstain pattern that is caused by a low velocity impact force to a blood source.

Bloodstain drops created or formed by the force of gravity acting along.

A bloodstain that consists of only its outer periphery, the central area having been removed by wiping or flaking after liquid blood has partially or completely dried.

The common point area on a two dimensional surface over which the directionality of several blood drops can be retraced.

The common point area in a three dimensional space to which the trajectories of several blood drops can be retraced.

A bloodstain pattern that is produced by blood released under pressure as opposed to an impact such as arterial spurting.

A deflection of blood after impact with a target surface that results in straining of a second target surface.

Small droplets of blood that are distributed around a drip of pool of blood as a result of blood impacting the target surface.

Blood which has been dispersed as a result of force applied to a source of blood patterns.

The pointed or elongated stains which radiate away from the central area of a bloodstain.

The transfer of blood from a moving source onto an unstained surface. Direction of travel may be determined by the feathered edge.

A surface upon which blood has been deposited.

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

An absence of blood in otherwise continuous bloodstain pattern.

A small blood drop that originates from a parent drop of blood due to the wave-like action of the liquid in conjunction with striking a surface.

A bloodstain pattern created when an object moves through an existing stain, removing and/or altering its appearance.

The soft spongy material in the center of the bones where blood cells are made.

A red protein responsible for transporting oxygen in the blood. Its molecule comprises four sub-units, each containing an iron atom bound to a heme group.

The ELISA test uses antibodies that help determine what kind of blood?

This kind of test can establish the possibility that a specific bodily tissue or fluid is present.

This test can determine specific biological material.

This test reveals blood traces with a light-producing chemical reaction between several chemicals and hemoglobin.

How are blood patterns useful in solving crimes?

What is the formula to calculate the angle of impact?

The "tail" of the blood drop leads to what?

If someone is walking, what will the blood trail look like?

If a bloodstain is still wet and needs collected what should the investigator do?

If an object has blood evidence on it, and needs collected, what type of packaging should it be collected in?