How might a void pattern be useful to investigators? It is created when an object blocks the deposition of blood spatter onto a target surface or area//they can help investigators establish the position of the victim or assailant at the time of the incident. What is a void pattern?
What is a void pattern in forensic science?
What is a void pattern? How might a void pattern be useful to investigators? It is created when an object blocks the deposition of blood spatter onto a target surface or area//they can help investigators establish the position of the victim or assailant at the time of the incident.
What is the difference between initial breach and void pattern?
created when a victim suffers an injury to a main artery or the heart; initial breach shows a mist pattern expirated blood stain pattern blood can accumulate in lungs, sinuses, and airway; forcibly exhaled void pattern created when an object blocks the deposition of blood spatter onto a target surface or object transfer pattern
How do you differentiate between expirated blood and void pattern?
The presence of bubbles of oxygen in the drying drops can differentiate a pattern created by expirated blood, it also may be lighter in color than impact spatter as a result of being diluted by saliva. What is a void pattern? How might a void pattern be useful to investigators?
What can we learn from the patterns of impact spatter?
Impact spatter patterns can offer investigators clues about the origin of the blood spatter and the position of the victim at the time of impact. Area of convergence - the area on a 2D plane where lines traced through the long axis of several individual bloodstains meet; this approximates the 2D place from which the bloodstains were projected.
What is a void pattern?
Suzanne Bell. In bloodstain patterns, a void is an area that is somehow shielded and thus does not show staining that would otherwise be expected. Also called a shadow pattern, a void pattern can be seen when a person's body, shoe, hand, etc.
What is a void pattern in forensics?
A void is caused when an intermediate object intercepts the trajectory of blood droplets in flight, while on their way to an otherwise unobstructed final target surface.
What is a void Why would it be useful in an investigation?
Though void patterns may be the cause of discouragement, they can also provide a solid piece of the crime scene puzzle. “Voids tell investigators many things, first and foremost, that an item has been removed from the crime scene,” Sergeant Wade Proctor of the Ruidoso Police Department said.
What are some things void patterns can show investigators?
Void Patterns A void occurs when a person or object blocks the path of the blood. They are important because voids can show investigators if objects are missing from the scene, where a person or persons were at the time of the incident, and if a body was moved.
What must Investigators do before analyzing blood stains?
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.
Why is it important to look at the surface that the blood was dropped on?
Too much blood can disguise spatter or make stain patterns unrecognizable. Conversely, too little blood, just one or two drops, will likely yield little or no useable information. Stains that overlap or come from multiple sources present challenges to analysts, but often reveal valuable details about the crime.
What are three major problems with evidence in criminal investigations?
3 potential problems with evidence are relevance, too much evidence, and accuracy. Identify and discuss the three goals associated with the criminal investigation process.
Why is evidence important in criminal justice system?
Evidence is used to establish proof that a crime was committed or that a particular person committed that crime. To prove something (e.g., that Casey Anthony killed Caylee) is to eliminate uncertainty, or to eliminate some degree of uncertainty, regarding the truthfulness of the conclusion.
How do forensic scientists determine what evidence is important?
Forensic evidence is obtained through the use of scientific methods. Investigators may use ballistics, blood tests, or DNA testing as forensic evidence. Think of any courtroom drama you've ever seen on TV.
What can bloodstain patterns tell an investigator?
Because blood behaves according to certain scientific principles, trained bloodstain pattern analysts can examine the blood evidence left behind and draw conclusions as to how the blood may have been shed.
Why is knowing the point of origin especially helpful in carrying out an investigation?
In the reconstruction of an incident scene involving bloodstains, it is often beneficial to establish the point of origin of bloodstains, based on directionality and angle of impact. The examination of certain bloodstains may allow for the determination of the direction of travel of blood as it impacted the target.
When an object with blood on it touches one that does not have blood on it this produces what?
Chapter 9,12&14 testQuestionAnswerWhen an object with blood on it touches one that doesn not have blood on it, this produces a(n):contact patternWidely spaced bloody shoeprints with satellite spatter between the shoeprints were likely deposited by an individual who was:running45 more rows
What is a void blood?
Void - An absence of blood in an otherwise continuous bloodstain or bloodstain pattern. Wipe Pattern - An altered bloodstain pattern resulting from an object moving through a preexisting wet bloodstain.
What is a transfer pattern?
A transfer pattern is a pattern that forms when a wet, bloody surface comes in contact with a second surface. A recognizable image of all or part of the object that caused the pattern can sometimes be observed in the pattern.
What is the pattern of arterial spurting?
Arterial Spurting (or gushing) Pattern -- Bloodstain pattern(s) resulting from blood exiting the body under pressure from a breached artery. Back Spatter -- Blood directed back towards the source of energy or force that caused the spatter.
What is a cast off pattern?
Introduction. Cast-off spatters often occur during crimes involving beating events. In the context of bloodstain pattern analysis, a cast-off spatter pattern is defined as “a bloodstain pattern resulting from blood drops released from an object due to its motion” [1].
What is void in physics?
A void is 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 spatter's deposition. The blank space on the surface or object can give a clue to the size and shape of the missing object or person.
What is flow pattern?
Flow pattern - a bloodstain pattern formed by the movement of small or large amounts of blood as a result of gravity's pull. If a flow found on an object or body does not appear to be consistent with the direction of gravity, one may surmise that the object or body was moved after the blood had dried.
What is the drawback of fingerprint classification?
Drawback - a fingerprint classification system cannot identify an individual by itself, it merely provides the fingerprint examiner with a number of candidates, all of whom have an indistinguishable set of prints in the systems file.
What factors affect the amount of back spatter produced by a gunshot wound?
Name three factors that affect the amount of backward spatter produced by a gunshot wound. The location of the injury, the size of the wound created, and the distance between the victim and the muzzle of the weapon all affect the amount of back spatter that occurs.
Why is the direction of a blood stain more discernible?
As a stain becomes more elliptical, its direction becomes more discernible because the pointed end of a bloodstain faces its direction of travel. The distorted end of an elongated stain indicates its direction of travel.
What is a loop in fingerprints?
Loops - a class of fingerprints characterized by ridge lines that enter from one side of the pattern and curve around to exit from the same side of the pattern. Whorl - a class of fingerprints that includes ridge patterns that are generally rounded or circular in shape and have two deltas.
What is forward spatter?
Forward spatter is blood that travels away from the source in the same direction as the force that caused the spatter. Back spatter is blood directed back toward the source of the force that cause the spatter. Back spatter is more likely to be deposited on the object or person who was creating the impact.