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fandomhigh2006-01-20 10:10 am
equalsmcsquared.livejournal.com) wrote in fandomhigh2006-01-20 10:10 am
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Forensics (5th Period)
"Today, we will be continuing our discussion on blood spatter analysis."
OBJECTIVES
* Establish the relationship between dropping height and blood drop diameter
* Recognize patterns around the drop, such as satellite spatter or spines
* Develop an understanding of the common types of bloodstain patterns found at a crime scene
* Create and examine vertical blood drop patterns on various textured surfaces
* Differentiate between high velocity and medium velocity impact spatter
"Following the instructions in these handouts, we will simulate a crime scene. Today, we will be doing Part one of Part A."
Part A: Vertical Drip Pattern Recognition
Materials Needed per Group:
Simulated Drip and Projected Blood
Meterstick
2 5 x 8 notecards
Metric Calipers or 15 cm ruler calibrated in mm.
10 mL graduated cylinder
Part 1: Single Blood Drop Patterns
1. Hold the bottle of Simulated Drip and Projected Blood upside down in a vertical position so that the dropper end is 15 cm from the target surface (card).
2. Gently squeeze the bottle so that one drop is released from the bottle at the 15-cm height and lands on the card.
3. Mark this specimen as vertical drop at 15 cm.
4. Reposition the blood bottle so that the tip is 30 cm from the target surface and next to the previous drop. Repeat Steps 2 and 3, labeling for the correct height. Try to get three drops across one card.
5. Generate the remaining blood drops at the vertical heights listed in Data Table A using the same procedure.
6. Briefly allow the blood drops to dry.
7. When blood drops are dry, measure the diameter of the circular part of the drop in millimeters (Figure 1). If there are spines or protrusions on the drop, disregard them as part of the measurement. Record your measurements in Data Table A.
OBJECTIVES
* Establish the relationship between dropping height and blood drop diameter
* Recognize patterns around the drop, such as satellite spatter or spines
* Develop an understanding of the common types of bloodstain patterns found at a crime scene
* Create and examine vertical blood drop patterns on various textured surfaces
* Differentiate between high velocity and medium velocity impact spatter
"Following the instructions in these handouts, we will simulate a crime scene. Today, we will be doing Part one of Part A."
Part A: Vertical Drip Pattern Recognition
Materials Needed per Group:
Simulated Drip and Projected Blood
Meterstick
2 5 x 8 notecards
Metric Calipers or 15 cm ruler calibrated in mm.
10 mL graduated cylinder
Part 1: Single Blood Drop Patterns
1. Hold the bottle of Simulated Drip and Projected Blood upside down in a vertical position so that the dropper end is 15 cm from the target surface (card).
2. Gently squeeze the bottle so that one drop is released from the bottle at the 15-cm height and lands on the card.
3. Mark this specimen as vertical drop at 15 cm.
4. Reposition the blood bottle so that the tip is 30 cm from the target surface and next to the previous drop. Repeat Steps 2 and 3, labeling for the correct height. Try to get three drops across one card.
5. Generate the remaining blood drops at the vertical heights listed in Data Table A using the same procedure.
6. Briefly allow the blood drops to dry.
7. When blood drops are dry, measure the diameter of the circular part of the drop in millimeters (Figure 1). If there are spines or protrusions on the drop, disregard them as part of the measurement. Record your measurements in Data Table A.