Forensic Science Unit 6 - Norfolk Public Schools
[Pages:34]Forensic Science Unit 6
Blood Spatter
Packet #4
May 18th-June 5th
Ms. Wines
Assignments:
1. Forensic Files: The Wilson Murder, Analysis Worksheet 2. Blood Spatter Notes: Continued 3. Crime Case Studies
a. Case Study #1 b. Case Study #2 4. Bloodstain Practice 5. Lab #8 Distance Falling v. Surface Texture (Optional) 6. Lab #9 Direction of Travel and Angle of Impact 7. Three `Messy' Blood Spatter Experiment (Optional) 8. Case Study: Unconvincing Circumstantial Evidence; Worksheet 9. Blood Detection Notes 10. It's No Use Trying to Hide Blood ... Worksheet 11. Forensic Files: Naked Justice; Questions 12. Case Study: Which Neighbor is a Killer? Worksheet 13. Case Study: The Death of Tammy's Parrot Questions 14. Bloodstain Pattern Analysis Lab Quiz
1
FORENSIC FILES: The Wilson Murder
Instructions: Watch Forensic Files The Wilson Murder, and complete the Forensic Files analysis
worksheet.
2
Blood Spatter Notes-Continued
Instructions: Take NOTES. Notes are available on google classroom under Unit 6-Blood Spatter 2
Spatter Pattern and type of Wound
? _______ Velocity Impact (______ ft/sec) ? _________-mist spatter pattern
? Size of Droplets ? less than 1 mm ? Ex. _________________________
? ___________-Velocity Impact (_____ ft/sec) ? Size ? 1-4 mm ? Ex. ? ________________, _________________ ? ___________-Velocity Impact (______ ft/sec) ? Size ? 4 to 6 mm ? Ex ? blunt object impact (_______________, _____________, etc)
Point of origin Angle of Impact Examination of Directionality of Blood
? Shape provides clues to ______________________ from which blood ____________________ ? _________________ drop (width _____ length) ? fell straight down ? Typical of dripping ____________ (passive) ? ______________ drop (width _____ length) ? possible to determine direction blood was _____________
3
? When blood comes into contact with another surface, it adheres or __________ to it ? Point of impact may appear ___________ and _____________ than rest of drop of blood spatter
? ___________________ ? keeps blood moving in direction it was traveling ? As droplet moves ________ from source, it _______________ and may produce a thinner, ______________-like appearance ? ________ points in direction of blood's movement ? ____________________ or _____________________ drops may appear in _____________ of moving droplet of blood
This is the TAIL
ANGLE of IMPACT - the _____________ angle formed between the ________________ of the blood drop and the plane of the surface it ______________.
________________________
get _________ angle of droplet from W and L 4
Angle of Impact (AOI) Calculations
? accurately measuring the ________ and __________ of a bloodstain, the impact angle can be calculated using the SIN ____________ below: AOI = SIN-1 W / L
? W ? Width of blood drop ? L ? Length of blood drop
5
Lines of Convergence
? ____________ of source can be determined if there are at least ___________ drops of blood spatter.
? ______________________________ ? found by drawing straight lines down the long axis of blood spatter and noting where they ______________
? __________ view of the location of the source
Point of Origin
? lies at a point in space _______________ the point of convergence. o Measurement of the impact angle allows for translation of the 2-D image (__________________) into a 3-D one (_______________).
6
1. First measure the ______________ from ________ blood stain along its central axis to the POC (distance = y)
2. Then take the TAN of the ______________ AOI. 3. Third, __________________ the TAN of the AOI by the _________________. 4. Measure that ____________ from the floor up the ________________________ axis and you
will arrive at the Point of Origin (PO) FORMULA: PO = TAN (AOI) x y
1. Falling directly to floor @ ________________ angle will produce circular drops, with secondary satellites being more produced in the surface hit is textured. ? known as a ______________ fall. 7
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