1. Blood Spatter Analysis

2. Blood Sample Collection Methods 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

3. Blood Spatter Analysis Passive Transfer Projected

4. Transfer 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

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

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

7. Projected 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 sin(impact angle) = width/length

8. Blood Spatter

9. Impact Speed Low Impact High Impact Medium Impact

10. Shape of Spatter - Direction WHY?

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