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Daily Trivia

Daily Trivia. Women blink nearly twice as much as men. . Agenda. DT Agenda Bloodstain Notes Classwork Homework. Bloodstain Science. Forensic Science. BPA. Bloodstain Pattern Analysis How can an investigator use bloodstain patterns to analyze a crime scene?

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Daily Trivia

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  1. Daily Trivia • Women blink nearly twice as much as men.

  2. Agenda • DT • Agenda • Bloodstain Notes • Classwork • Homework

  3. Bloodstain Science Forensic Science

  4. 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

  5. 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.

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

  7. Single Trail Multiple Trail

  8. Pool

  9. 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

  10. Arterial Spurt

  11. Radial

  12. Cast off

  13. High vs Low velocity

  14. 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.

  15. Luminol • Used to locate traces of blood, even if it has been cleaned or removed. • Only lasts 30 seconds. • Also reacts to some metals, paints, cleaning products and plant matter. • Can destroy other evidence in the crime scene. • For this reason, investigators only use luminolafter exploring a lot of other options

  16. Homework • Bloodstain Pattern WS

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