Exam 4: Crime Scene Reconstruction: Blood Stain Pattern Analysis

Crime scene reconstructions have the best chance of accuracy if:

What determines the size of blood drops in a cast-off pattern? Explain.

In general, as both the force and velocity of impact increase, what happens to the diameter of the resulting blood droplets?

The pointed end of a bloodstain always faces its direction of travel.

In general, as the force of the impact on the source of blood increases, the velocity of the blood droplets emanating from the source ________.

________ transfer patterns are produced when the object makes contact with the surface and the object is removed without any movement.

What can be concluded if a flow found on an object or body does not appear consistent with the direction of gravity?

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 ________ spatter that occurs.

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 -Satellite spatter

An investigator is faced with clustered and irregularly colored bloodstain patterns at a crime scene that he believes could have originated from an arterial or oral injury. What characteristics of projected and expirated blood patterns can assist the investigator in differentiating these patterns from other pattern types and each other?

A trail pattern leading away from the victim at a stabbing scene was most likely created by:

The most common type of bloodstain pattern found at a crime scene is:

Name two major limitations of crime-scene reconstruction.

The pressure of the pumping of oxygenated blood out of an injury causes bright red-colored blood to spurt out and form a(n):

The presence of a cast-off pattern shows that there were more than ________ blow(s)delivered:

If a murder victim's blood is found in the muzzle of a firearm: