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Blood Spatter Analysis

Blood Spatter Analysis. Swab – Use a web swab to transfer the blood onto the swab (must allow it to dry!) Scrape – Use a file and tweezers to scrape and lift off the blood sample Cut out – Take the entire piece with you. Blood Sample Collection Methods. Passive Transfer Projected.

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Blood Spatter Analysis

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  1. Blood Spatter Analysis

  2. Swab – Use a web swab to transfer the blood onto the swab (must allow it to dry!) • Scrape – Use a file and tweezers to scrape and lift off the blood sample • Cut out – Take the entire piece with you Blood Sample Collection Methods

  3. Passive • Transfer • Projected Blood Spatter Analysis

  4. Occurs when wet bloody surface comes in contact with another surface, leaving a trace or impression of blood • A recognizable image may or may not appear Transfer

  5. Drops as an action of gravity • Can be categorized into drops, clots, pools, drip patterns Passive

  6. Blood spatter can occur on all types of surfaces but may appear slightly different • Glass (very smooth) • Linoleum (slight texture) • Wood/concrete (very textured Projected

  7. Projected blood spatter occurs when the initial source is exposed to an action or a force • Size, shape, and number of stains will depend on the amount of force used Projected sin(impact angle) = width/length

  8. Blood Spatter

  9. Low Impact Medium Impact High Impact Impact Speed

  10. WHY? Shape of Spatter - Direction

  11. The blood spatter can be retraced to a single area – giving investigators clues to how the crime occurred Point of Convergence

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