blood spatter pattern evidence By Samantha Le. A3

how does blood spatter get used in the field?

Blood gets used in the field to be able to identify how many possible victims were there, what type of weapon was used to cause the bloodstains, possibly how many suspects there were, the positions and locations of the victims, and additionally how far away the victims and their locations were to the suspects during the attack.

Strings are sometimes used as a way to pin point the location of which the victim was killed.

Types of blood stains

There is three types of blood stains: passive, transfer, and projected or impacted

Passive stains are created by flow of blood caused upon by gravity, usually created by drops and flows.

Transfer stains are usually caused by a person coming into contact with the blood, or the blood coming in contact with another object that causes it to be moved around

Impact spatter results in blood being projected through the air, including spatters, gushes or even spurts.

how blood is used to analyze the crime scene

Blood can be used to determined who was at the crime scene or if the blood belonged to a person or animal that might've been in the scene. By having blood on the crime screen, it helps the investigators eliminates people related to the actual crime or those who were just by-passers if the scene happened in a public place. The amount of blood at the scene can also help determine how they were killed, such as large bloods could indicate they bled to death. Although, having too much blood stains can make a bloodstain hard to recognize but having too little can result in little to no information given.

The way the blood drips can also help identify how the person was killed

Limitation of blood spatters

Some limitations can be that it doesn't help the investigators recreate the entire scenario, along with that it can't be determine if the attacker was young or old, their gender, or if the attack was planned or at random. Other limitations can include that two events could've happened at the same time and overlapped onto each other, making it harder to identify which blood spatter belonged to which event.

Citations

"Bloodstain Pattern Analysis." Bloodstain Pattern Analysis: How It’s Done. N.p., n.d. Web. 22 Mar. 2017.

"International Association of Bloodstain Pattern Analysts | IABPA." International Association of Bloodstain Pattern Analysts | IABPA. N.p., n.d. Web. 22 Mar. 2017.

"Bloodstains." Bloodstains. N.p., n.d. Web. 22 Mar. 2017.

Kunz, S. N., T. Klawonn, and C. Grove. "[Possibilities and limitations of forensic bloodstain pattern analysis]." Wiener medizinische Wochenschrift (1946). U.S. National Library of Medicine, Sept. 2014. Web. 22 Mar. 2017.

About the Author: Felicity CarlysleFelicity Carlysle is a 2nd year Forensic Science PhD student at the University of Strathclyde. "Seeing Red – Presumptive Tests for Blood." TheGIST. N.p., n.d. Web. 22 Mar. 2017.

Elert, Glenn. "Density of Blood." Density of Blood - The Physics Factbook. N.p., n.d. Web. 03 Apr. 2017.

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