Blood Spatter Analysis

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Presentation transcript:

Blood Spatter Analysis Kendall/Hunt Publishing Company

Kendall/Hunt Publishing Company Questions? Kendall/Hunt Publishing Company

Unknown Stain at a Scene Questions to be answered: 1.Is it blood? 2.Is it human blood? 3.Whose is it? Determine blood type, alcohol content, drugs present Determine the method(s) in which blood may have been deposited Kendall/Hunt Publishing Company

Presumptive Tests for Blood Determination Kastle-Meyer color test—a mixture of phenolphthalein and hydrogen peroxide; the hemoglobin will cause the formation of a deep pink color if blood is present Hematest® tablet—reacts with the heme group in blood causing a blue-green color Luminol test—reaction with blood to produce light Kendall/Hunt Publishing Company

Population Distribution of Blood Types in the U.S. Kendall/Hunt Publishing Company

Kendall/Hunt Publishing Company

Kendall/Hunt Publishing Company How to Read Results Kendall/Hunt Publishing Company

Blood Droplet Characteristics A blood droplet will remain spherical in space until it collides with a surface COHESIVE-sticks to itself Kendall/Hunt Publishing Company

Conditions Affecting Shape of Blood Droplet Size of the droplet Angle of impact Velocity at which the blood droplet left its origin Height Texture of the target surface On clean glass or plastic—droplet will have smooth outside edges On a rough surface—will produce scalloping on the edges Kendall/Hunt Publishing Company

Questions Answered by Blood Spatter Interpretation The distance between the target surface and the origin of blood The point(s) of origin of the blood Movement and direction of a person or an object The number of blows, shots, etc. causing the bloodshed and/or the dispersal of blood. Type and direction of impact that produced the bloodshed The position of the victim and/or object during bloodshed Movement of the victim and/or object after bloodshed Kendall/Hunt Publishing Company

Bloodstain Terminology Angle of impact—angle at which blood strikes a target surface. (900 vs 450) Backspatter—blood that is directed back toward the source Point of origin-place where blood leaves the body Kendall/Hunt Publishing Company

Kendall/Hunt Publishing Company Blood Evidence Class evidence for blood would include blood type. If you can determine the DNA you would have individual evidence. Blood stain patterns are considered circumstantial evidence in a court room. Experts could argue many points including direction of travel, height of the perpetrator, position of the victim, left/right hand, whether the body was moved, etc. Kendall/Hunt Publishing Company

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