LAB : Blood Spatter – When completed, submit results by selecting “SUBMIT ASSIGNMENT” above.
Download the lab which the instructor has provided and read it
Blood spatter Lab-1.pdfActions
This week you will do calculations. Read every page of the lab and then try to carry out the calculations.
- Do your best and submit your conclusion about what happened in this case on the next page.
- Using the two main formulas in the lab, calculate the Area of Origin and Area of Convergence for the following case:
You are an Investigator for the State in Corrections. Two men are locked in a cell overnight. In the morning one man is dead and the other man claims he was attacked in the middle of the night by the decease, who was wielding a portion of a “broken-off” wooden mop handle. There is one area of impact on the deceased’s head. What do your calculation suggest?
Use the formulas on pages 8 and 11
Finding angle of impact
- The sine of the Angle of Impact = width divided by the length.
- Sine i = Width / Length of blood drop
- Length of blood drops = 0.877 inch
- Width of blood drop = 0.5 inches
http://www.rapidtables.com/calc/math/Arcsin_Calculator.htm (Links to an external site.)Links to an external site.
Angle of impact = ________ ?
TAN i = H/D
- i = angle of impact (from above formula)
- D = distance from blood drops to area of convergence, given below
- H = unknown distance above target surface
Find Area of Origin
H = TAN i * D
- Angle of impact = i = (from 1st calculation) in degrees
- Distance to the Area of Convergence (AOC) = D = 30 inches
- H =?
What does the height from the origin of the blood tell us?
If you have a documented visual impairment, please describe what factors one would need to consider to determine Area of Origin and Area of Convergence?