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Unit 5 Blood

Unit 5 Blood. 5.5 Types of Blood Spatters. BPA. Bloodstain Pattern Analysis How can an investigator use bloodstain patterns to analyze a crime scene? Location and description of individual stains and patterns Direction a blood droplet was traveling by calculating angles of impact

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Unit 5 Blood

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  1. Unit 5 Blood 5.5 Types of Blood Spatters

  2. BPA • Bloodstain Pattern Analysis • How can an investigator use bloodstain patterns to analyze a crime scene? • Location and description of individual stains and patterns • Direction a blood droplet was traveling by calculating angles of impact • Area of origin of blood source or sources • The type of object used in attack (edged, blunt, firearm, etc.) • Minimum number of blows • The positions of the victim, suspect, and objects during events • The sequence of events

  3. Bloodstain Pattern Analysis Terms • 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. • Angle of Impact – The angle at which a blood droplet strikes a surface. • Parent Drop – The droplet from which a satellite spatter originates. • Satellite Spatters – Small drops of blood that break off 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.

  4. Passive Bloodstains • Patterns created from the force of gravity • Drop, series of drops, flow patterns, blood pools, etc.

  5. Single Trail Multiple Trail

  6. Pool

  7. Patterns that occur when a force is applied to the source of the blood • Low, medium, or high impact spatters, cast-off, arterial spurting, expiratory blood blown out of the nose, mouth, or wound. Projected Bloodstains

  8. Arterial Spurt

  9. Radial

  10. Cast off

  11. High vs Low velocity

  12. Transfer or Contact Bloodstains • The pattern created when a wet, bloody object comes in contact with a target surface; may be used to identify an object or body part. • Wipe pattern from an object moving through a bloodstain or swipe pattern from an object leaving a bloodstain.

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