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Bloodstains and spatter

Out, damn'd spot! out, I say! One; two: why, then 'tis time to do't . Hell is murky. Fie, my lord, fie, a soldier, and afeard? What need we fear who knows it, when none can call our pow'r to accompt ?

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Bloodstains and spatter

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  1. Out, damn'd spot! out, I say! One; two: why, then 'tis time to do't. Hell is murky. Fie, my lord, fie, a soldier, and afeard? What need we fear who knows it, when none can call our pow'r to accompt? Yet who would have thought the old man to have had so much blood in him?Macbeth Act 5 Scene 1 Bloodstains and spatter

  2. Origin(s) of bloodstain Distance of bloodstain from target Direction from which blood impacted Speed with which blood left its source Position of victim and/or assailant Movement of victim and/or assailant Number of blows/shots Bloodstain analysis can tell…

  3. Viscosity – “resistance to flow” Surface tension – (liquids) resistant to penetration or separation; small mass of liquid which becomes detached becomes rounded into a sphere Falling blood drops are NOT tear drop shaped! Average drop about 0.05 mL (rapid bleeding makes larger, but slower bleeding doesn’t lead to smaller drops) Characteristics of blood

  4. Satellite Spatters Spines Parent Drop Spatter – Bloodstains created from the application of force to the area where the blood originated. Origin/Source – The place from where the blood spatter came from or originated. Angle of Impact – The angle at which a blood droplet strikes a surface. Bloodstain analysis terms Parent Drop – The droplet from which a satellite spatter originates. Satellite Spatters – Small drops of blood that break of from the parent spatter when the blood droplet hits a surface. Spines – The pointed edges of a stain that radiate out from the spatter; can help determine the direction from which the blood traveled.

  5. PASSIVE • drops created or formed by the force of gravity alone • examples: drops, drip patterns, clots, pools Categories of bloodstains

  6. Can determine location – tail will point in direction of travel Vertical drops are circular, increasing angles get more elongated Angle of impact (tail tells the tale)

  7. TRANSFER • created when a wet, bloody surface comes in contact with a secondary surface • examples: swipes, smears, smudges, wipes Categories of bloodstains

  8. PROJECTED • created when an exposed blood source is subjected to an action or force, greater than the force of gravity • examples: arterial spurt/gush, cast-off, impact spatter Categories of bloodstains

  9. Low-velocity (indicates dripping) • Less than 5 feet/second • Blood spots generally 4-8 mm in diameter • Medium-velocity (indicates blunt-force) • 5-25 feet/second • Generally 1-3 mm in diameter • High-velocity (indicates fired weapon) • 100 feet/second or more • Drops are a fine mist less than 1mm in diameter Impact spatter

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