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Forensic Science: Blood Analysis
Transcript of Forensic Science: Blood Analysis
Back to the Film
Investigating the Murder
(In the film)
Corruption by blood sample according.
How blood samples are collected to avoid corruption of blood samples:
Label all blood samples
Destroy tags, forms, and reports splashed with blood
clean up hands with diluted bleach, and dispose of contaminated clothing
"Digging" even Deeper
"A smooth surface, such as glass, will provide the recording of a stain with clean edges and shapes of proper geometric proportion. A rough surface, like concrete, will break the surface tension irregularly and generate a star burst, or spinning effect. An experienced analyst is able to use some of the most disrupted stains to recreate the event. Arterial spurts, for example, when compared with the anatomical location of the injury may provide information about the position when the injury was inflicted and any subsequent movement by the injured party. Castoff patterns, or drops that are thrown off of a swinging instrument in the arc of the swing, can illustrate the position of the assailant when swinging a knife, or club" (Ramsland).
. London: Usborn Publishing Ltd., 2007. Print.
Serology: It’s in the Blood.
Crimelibrary. 2004. Web. 27 Jan. 2015.
Serology: It's in the Blood.
Blood Pattern Analysis Crime Library. N.p., 2013. Web. 07 Feb. 2015.
Victim: Robert Paul, age 34
Divorced, has 3 kids
Witnesses: None came forth
All residence in the neighborhood were questioned by the police.
Blood pattern couldn't be determined
Discovered how to identify blood stains
First case, 1904
Ludwig Tessnow sentenced to death
Analysing blood patterns became easier:
Spray of tiny blood splats
Linear Stain Patterns
Serology: It’s in the Blood
Who did it?
What was discovered:
The murder weapon
More to the murder
Nosy Neighbors became suspects
Clues you may have missed in the film:
Edgar: “Yes, I knew Robert Paul. And yes I killed him. I thought I cleaned up the shovel enough to not get caught, I guess I was wrong.”
Hannah: “I had nothing to do with the murder, I heard yelling across the street, grabbed my phone in case I was going to call the police, and I went outside to see if I had a reason to or not. I thought I saw Edgar in the window so I got a closer look, when I did, I saw Edgar hit Robert with the shovel. I hid and when Edgar ran, I went in the back yard and grabbed the shovel to see if I could hide it, but I heard cop sirens so I jumped a fence, sprained my wrist, and ran, thats how my fingerprints got on the shovel.”
Hannah’s arm brace
Edgar’s hesitated answers