PRE-LAB QUESTIONS-3

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Pace University *

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Jan 9, 2024

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PRE-LAB QUESTIONS 1. List three circumstances that a CSI may be able to determine from a bloodstain pattern. Spine, Satellite spatter, parent drop 2. Label Parts A - C in the figure below. Image of blood spatter for labeling. A-Spine, B- Satellite spatter, C-Parent drop 3. You are investigating a crime scene where a victim was stabbed multiple times while they were incapacitated on the floor next to a wall. Estimate the number of stab wounds based on the bloodstain pattern in the figure below. Explain how you determined your answer. An image of blood spatter for question 3. I think there may be 6 stab wounds. I estimated this number because there appears to be 6 parent drops. EXPERIMENT 1: BLOODSTAIN ANALYSIS - HEIGHT AND VOLUME Data Tables Table 1: Bloodstain Diameter of a Single Drop at Varying Distances Distance from Impact (cm) Bloodstain Diameter (mm) Observations

15 12 No spatter 30 13 Edges fray out a little 45 14 Edges fray out a lot, start to see spatter 60 14 Spatter to the edge of the box 75 15 Spatter to the edges of the box 100 15 Edges frayed, most spatter Table 2: Bloodstain Diameter of Varying Drops at the Same Distance Number of Drops Bloodstain Diameter (mm) Observations 1 12 Small dot on paper, fairly circular 2 16 Some rough edges 3 19 Mostly round pooling in one spot 4 20 Mostly round pooling in one spot 5 22.5 Some rough edges but mostly circular 6 26.5 Not circular, one drop went a little too left, rough edges Table 3: 2 mL Bloodstain Diameter with Force Height (cm) Bloodstain Diameter (mm) Observations 15 38 Pooling, some spatter, mostly in one spot on the paper Post-Lab Questions

1. What happens to the bloodstain pattern as the distance from impact increases? Use your data to explain your answer. The pattern increases in diameter. The distance of 25cm and the diameter turned out to be 12mm. 2. What happens to the bloodstain pattern as the number of drops of blood increases? Use your data to explain your answer. The number of drops increases and the diameter of the bloodstain pattern also increases. 3. Compare the bloodstain patterns from Part 2 at 15 cm (1 drop) and Part 3 at 15 cm (2 mL). Describe two differences in the bloodstain patterns. This differed greatly from the bloodstain pattern in part 3 which had a larger diameter. 4. The figure below shows two bloodstains. Which bloodstain was most likely dropped from a higher distance? Explain your answer. Bloodstain A most likely came from a higher distance. There is far more spatter in the bloodstain B EXPERIMENT 2: BLOODSTAIN ANALYSIS – ANGLE OF IMPACT Data Tables Table 4: Average Bloodstain Length and Width at 60 o Angle of Impact (From a Height of 30 cm) Bloodstain Dimension Trial 1 Trial 2 Trial 3 Average Observations

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