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Blood Spatter Pattern Interpretation
15
Security
Nightmare
Next Door
Blood Spatter:
What is blood spatter?
The result of blood being
acted out by force
Blood Spatter Analysts
- Location & shape of blood drops
- Direction in which blood is coming from
- Type of weapon used in attack
- Timeline of events
Analysts determine...
WARNING
Sharp force injuries
Blunt force injuries
Sharp & Blunt Force
Crime scene photograph of Abigail Folger from the Charles Manson murders.
Size
Shape
Direction of blood drops
Size, shape & direction
Area of Convergence
Area of convergence
1. Passive stains
2. Transfer stains
3. Impact spatters
Types of spatter patterns
Three basic types of bloodstains:
Gunshot spatter
Gunshot Spatter
Cast-off Spatter
Cast-off spatter
Arterial Spray
Arterial spray
Expirated spray
Expirated Spray
- Determine the position of the victim
- Determine movement and direction of victim
- Determine possible weapons used
- Refute or confirm statements made by suspects
Meaningful Clues
Negative spacing
May 7th, 1987 - July 11th, 2005
Brittany Nicole Loritts
Brittany Loritts
Me
Brittany
Skeletons in the Closet
https://www.dailymotion.com/video/x59yzqe
- Section off the area with crime scene tape
- No unauthorized personnel
- Document and record any possible disturbances or contamination
The Crime Scene
- Interview witnesses
- Secure the scene
- Note contaminations
- Note position of doors, windows, light fixtures, etc.
From the murder of Meredith
Kercher in Italy, 2007
Documentation
Documentation of the
Crime Scene
Two types of blood collected at a crime scene:
Collecting Blood Samples
Liquid blood
Dried blood
CSI in Hollywood
True Crime
vs.
Hollywood Crime
- Color print film
- Infrared film
- Overall, medium-range, and close up photos
- Scaled photos
- Videography
Photography
Collection Methods
Swabs
& Slides
- Cut sample of fabric
- Scrape dried blood
- Tape lifting
- Wet cotton transfers
- Pipets
Lights on/Lights off
Luminol
Luminol
THE END
Multidisciplinary field:
- Biology
- Mathematics
- Physics
Who?
Where?
What?
Why?
How?
Blood Spatter Pattern Interpretation
JUST 3022: Crime Scene Investigations
Jacqueline Smith
May 2021