Lab: Blood Spatter Analysis
Name: __________________
Date: ____________ Hr: ___
Procedure:
Your group will be rotating through the 6 stations. At each station you will analyze a type of
blood spatter and answer the questions. You have 5 minutes. If you need to return to a station
after visiting all 6 stations you may do so.
STATION 1
1. Match the drops with the following questions….
____ drop that fell from less than one foot.
____ drop that hit at an angle of 45 degrees.
____ drop that hit at an angle of 20 degrees.
____ drop that fell from a distance between 2 and 4 feet.
____ drop that fell from a distance of more than 6 feet.
2. In what direction was drop # 3 traveling? _____________________________________
3. Was the surface that drop # 4 fell onto rough or smooth? ________________
4. What is the term for the edge of drop # 4? _________________
STATION 2
1. Name this type of pattern. ________________________
2. In what direction were the drops traveling? ___________________
3. What does this type of pattern usually indicate? ________________________________
STATION 3
1. Name the pattern. _____________________________
2. What are the two requirements to get this type of pattern? ________________________
________________________
3. The height of this pattern helps determine what? ________________________________
STATION 4
1. Name these 2 types of patterns. _____________________________________
2. Smearing indicates that the victim was __________________________________
3. ________ of blood indicate that the person was carried or moved on their own.
STATION 5
1. Name this type of pattern. ____________________
2. Who could leave this type of pattern? ____________________________
3. This pattern can be used to identify ____________ after an assault.
4. Blood is transferred to ________ or __________ and subsequent _____________.
STATION 6
Determine the angle of impact for the blood spatter. Record the data in the table.
1. Measure the width and length for each drop in mm.
2. Find the average width and average length for the drops.
3. Calculate the Width-Length ratio. (width divided by length)
4. To find the angle, take the sin -1 or inverse sin of your width-length ratio.
Drop
1
2
3
4
5
AVG
Width (mm)
Length (mm) Width-Length Ratio
XXXXXXXXXXXXX
XXXXXXXXXXXXX
XXXXXXXXXXXXX
XXXXXXXXXXXXX
XXXXXXXXXXXXX
Angle
XXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXX