Exam 4: Crime Scene Reconstruction: Blood Stain Pattern Analysis

The removal of an object or surface that was located between the origin of blood and the target surface during the bloodstain deposition leaves behind:

Voids may help investigators establish the body position of the victim or assailant at the time of the incident.

The location of injury, the size of the wound created, the distance between the victim and the muzzle of the weapon all affect the amount of backward spatter that occurs.

The dried perimeter of a bloodstain may be used to interpret:

More circular stains are found where the person was moving slowly enough to not form ________.

In the grid method of bloodstain documentation, a grid of squares of known dimensions is created over an entire pattern in order to:

The pointed end of a bloodstain always faces:

Back spatter consists of the blood projected backward from the source.

The amount of spatter from a blood droplet falling on a hard, non-porous surface is ________ that of a drop of blood of equal size, falling from the same distance, onto a softer, porous surface.

When an object with blood on it touches one that does not have blood on it, this produces a(n):

The ________ effect occurs when back spatter strikes the gunman and enters the gun muzzle.

The process of crime-scene reconstruction may enlist the expertise of all of the following EXCEPT:

Setting up squares of known dimension over the entire pattern describes the:

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once. A)The process by which the edges of a stain will dry to the surface in a specific period of time (dependent upon environmental and surface conditions)and will remain apparent even after the rest of the bloodstain has been disturbed from its original position B)A bloodstain pattern formed by the movement of small or large amounts of blood due to gravity's pull C)A bloodstain pattern produced when an object makes forceful contact with a source of blood, projecting droplets of blood outward from the source D)Blood directed back towards the source of the force that caused the spatter E)An area within a deposited spatter pattern that is clear of spatter, caused by an object or person blocking the area at the time of the pattern's deposition F)Small droplets of blood that are distributed around the perimeter of a drop or pool of blood that were produced as a result of the blood impacting the target surface G)Blood which travels away from the source in the same direction as the force which caused the spatter H)The area on a two-dimensional plane where lines traced through the long axis of several individual bloodstains meet. This approximates the two-dimensional place where the bloodstains were projected from. I)A characteristic bloodstain pattern containing spurts that results from blood exiting under pressure from an arterial injury J)The acute angle formed between the path of a blood drop and the surface which it contacts K)A pattern of bloodstains formed by the dripping of blood off a moving surface or person in a recognizable pathway separate from other patterns L)Blood that is expelled out of the nose, mouth, or respiratory system as a result of air pressure and/or air flow M)The location in three-dimensional space that blood that produced a bloodstain originated from. N)A bloodstain pattern created when a surface that carries wet blood comes in contact with a second surface. Recognizable imprints of all or a portion of the original surface or the direction of movement may be observed. O)A bloodstain pattern that is created when blood is flung from a blood-bearing object in motion onto a surface -Projected Pattern

The ________ of a bloodstain pattern in a three-dimensional space illustrates the position of the victim or suspect when the stain-producing event took place.

The velocity classification of an impact spatter pattern:

Setting up a rectangular border of rulers around the patterns and then placing a small ruler next to each stain describes the:

The less blood on an object, the smaller the stains produced.

The tails of the drops in a trail pattern point in the direction that the person was moving.

A blood stain that impacts a surface at a low angle will have a ________ tail than one that impacts at a higher angle.