Page 6 - Patterns of Murder Blood Spatter
P. 6
SPREADSHEETS DROPPING BLOOD
This lab requires that you download the The blood dropping procedure must be performed
Excel spreadsheet from www.LyleAndLouise.com. consistently between individuals to obtain the
Visit the “Downloads” page, create/login to best data.
an account, and register your product to
download the supplemental material for
this module. Instruct students to always hold pipette
vertically.
Before dropping blood, shake the bottle
EQUATIONS vigorously. Recap and shake often during
By analyzing their data, students should come up the lab.
with equations similar to the ones shown below.
While dropping blood, hold constant pressure
on the pipette and make 4-5 separate blood
Angle vs. Arc Sin is y = 55.743x 4.9547 drops in succession. The first drop is unlikely
to be useful as it will frequently contain air.
Height vs. Width is y = 610x 410 The remaining drops should be measured
and used for data analysis.
Measure drops only after they have dried.
Note that students’ equations will vary, but if a
group is having trouble with Lab 2, the equations Do not allow the paper to be tilted while
above will allow them to complete Lab 3. drying as this will produce faulty results.
6 THE MYSTERY OF LYLE AND LOUISE
