Blood in Flight Notes 3.2.

Slides:

Advertisements

Similar presentations

Bloodstain Evidence May reveal: Origin(s) of bloodstain Distance of bloodstain from target Direction from which blood impacted Speed with which blood.

Advertisements

Forensic Characterization of Bloodstains

Blood Spatter Analysis torial.htm.

Blood Spatter Analysis. Blood Sample Collection Methods Swab – Use a web swab to transfer the blood onto the swab (must allow it to dry!) Scrape – Use.

Bloodstain Pattern Interpretation Forensic Science.

Blood Spatter Analysis. General Rules  Directionality of a blood drop while in flight is usually obvious from the geometry of its resulting bloodstain.

Blood Part II – Spatter.

Copyright © 2013 Crosscutting Concepts, LLC. All Rights Reserved. Warm-Up November 19, 2014 What are pieces of information.

Bloodstain Terminology WARNING Contains graphic images.

BLOODSTAIN PATTERNS. BLOOD COMPONENTS Plasma fluid portion of normal unclotted blood red blood cells, white blood cells, and platelets are suspended in.

Blood Spatter Evidence It is a field of forensic investigation which deals with the physical properties of blood and the patterns produced under different.

Unit 5 Blood 5.3 Blood Spatter Basics. Blood Spatter Evidence A field of forensic investigation which deals with the physical properties of blood and.

Bloodstain Evidence May reveal: Origin(s) of bloodstain Distance of bloodstain from target Direction from which blood impacted Speed with which blood.

Bloodstain Evidence May reveal: Origin(s) of bloodstain Distance of bloodstain from target Direction from which blood impacted Speed with which blood.

Bloodstains Pattern Analysis

What is forensic science? Forensic Science is the application of science to the law. It often involves police officers and scientists from many branches.

BLOOD SPATTER ANALYSIS CP Forensics Alvarado.

Bloodstain Evidence May reveal:

BLOODSTAIN PATTERN ANALYSIS

F5 Press F5 on the keyboard to start the slideshow.

Blood Spatter Mrs. L. Fox. Bloodstain Formation Examining the pattern of the bloodstain can reveal The direction from which blood originated The angle.

Daily Trivia Women blink nearly twice as much as men.

Bloodstains A field of forensic investigation that deals with: – physical properties of blood –patterns produced by forces being applied to blood Blood,

Serology III Bloodstain Pattern Analysis. Forwards Backwards.

Forensic Science Lab Activity T. Trimpe Warning: Some material in this presentation and related videos may be too graphic.

Blood patterns at a crime scene. Why it is important A basic understanding of blood spatter analysis allows first responding officers and investigators.

Drip 1: Blood dripping into itself from height of 1 m (8 drops) 38.

BLOODSTAIN PATTERN ANALYSIS TUTORIAL

FORENSIC SCIENCE Serology These are useful terms in determining the bloodstain pattern 1.

Original presentation by Detective Gregory Restina

Bloodstain Pattern Analysis

By Ronnie Graves.

Bloodstain Pattern Analysis

5.2: BLOOD TESTS & SPATTER ANALYSIS

Blood Spatter in Forensics

Bloodstain Evidence May reveal:

Bloodstain Evidence May reveal:

5.4 Blood Spatter Patterns

BLOODSTAIN PATTERN ANALYSIS TUTORIAL

BLOOD SPATTER ANALYSIS or Blood Pattern Analysis = BPA

Blood Found at Crime Scene

Stain Patterns of Blood

Blood Spatter In 1939 the meaning of the spatter pattern was first analyzed. When a wound is inflicted, a blood spatter pattern may be created. It takes.

Blood Spatter Analysis

Bloodstain Science Warning: Some material in this presentation and related videos may be too graphic for some people.

Bloodstain Science.

Blood Spatter Analysis

Forensic Characterization of Bloodstains

Bloodstain Pattern Analysis

Blood Part II – Spatter.

Bloodstain Evidence May reveal:

Definitions of Key Bloodstain Pattern Analysis Terms

Forensic Science Lab Activity

Bloodstain Pattern Analysis… Bloodspatter

Blood Students will be able to:

Blood Spatter Analysis

Blood Spatter Analysis

Blood – a Liquid Blood is nothing more than a liquid

Forensic Science Lab Activity

Blood Part II – Spatter.

Body Fluids Forensic Serology.

Presentation transcript:

Blood in Flight Notes 3.2

How’d the blood get there? Speed Low, Medium, and High Velocity Blood Spatter Volume Type of Impact Cast-off Blood (centrifugally flung blood) Secondary Cast-off Blood (reverse facing satellites) Ricochet Blood (hits surface and breaks up) Projected Blood (large volume, arterial) Blood on Blood (irregular, substantial # of satellites)

How’d the blood get there? 4. Contact stains Transferred blood (e.g., bloody handprint) Smeared blood (wipes and swipes) Absorbed blood (fabric) Running blood (on non-horizontal, non-porous surface)

Low Velocity Blood Drops formed by the force of gravity Shape = spherical Volume = 0.05mL Acceleration = 32ft/sec/sec ( = -9.8m/s2) Terminal Velocity reached from ~25 feet above the ground (height of terminal velocity) Terminal Velocity is 40ft/sec An increase in height will result in an increase in the size of the spatter (to a height of 25 feet)

Low Velocity Blood

Medium Velocity Blood Drops formed by forces greater than gravity Result from the forceful impact of one object with another Volume = less than 0.05mL Most often seen in crimes involving stabbing or bludgeoning

Medium Velocity Blood

High Velocity Blood Drops formed by forces greater than gravity The drops are atomized and have a diameter of less than 1mm Only seen in crimes involving gun shots

High Velocity Blood

Cast-off Blood A bloody object is swung and the blood is cast off due to centrifugal force The blood tends to form a track of droplets Each swing produces its own track (why is this important to investigators?)

Cast-off Blood

TRANSFER BLOOD A transfer bloodstain is created when a wet, bloody surface comes in contact with a secondary surface (a wipe). A recognizable image of all or a portion of the original surface may be observed in the pattern, as in the case of a bloody hand or footwear. This is called Ghosting.

TRANSFER BLOOD

TRANSFER BLOOD

Shadowing/Ghosting/Void

Skeletonized Stain

Determining the Angle of Impact

Determining Direction

Determining Point of Origin

Aterial Spurts

Link to other blood spatter images and review of Blood Spatter Lab