Page 5 - Strands of Evidence Hair And Fiber
P. 5
Teacher’s
Notes
hese notes are provided to assist in the RUNNING THE LAB
preparation and execution of the laboratory Because of the multiple sources of evidence that must
Texperiment. A solutions key for the preand be kept separate, this lab may be complicated to run.
post-lab questions can be found on pages 9 and 10, Instead of keeping all evidence on the same table,
respectively. having three separate areas for each of the evidence
sources is recommended. Emphasize to students the
importance of keeping the evidence separate.
SUPPLIES If students are new to using a microscope, consider
Evidence from the Truck (6 envelopes) devoting a lab session prior to beginning this module to
microscope use and technique. Typically, a microscope
Evidence from the Cabin (30 bags) with 40X and 100X magnification is suitable for this lab.
Evidence from the Suspects (12 bags)
This lab may easily be split into two or three days,
Data Collection Sheets
depending upon your time constraints. On the first
Microscope Slides (2 boxes of 72) day, students can remove strands from the evidence tape
and build the primary evidence ‘database’. The following
Microscope Cover Slips (2 boxes of 100)
day, students can compare the strands from the
Hair and Fiber Mounting Media (6 bottles) suspects to those from the evidence tape.
The second day may also be split between the
evidence and suspect sources, in which case
OTHER SUPPLIES AND the second part of the third day can also be used
EQUIPMENT REQUIRED
to review and analyze the evidence.
Filters, Funnels, and Flasks
After all of the trace evidence has been collected, it
Light-transmitting microscopes (6-12) will all be entered on the evidence sheet used by
the entire class. Once completed, photocopies of this
Hair dryer (optional) sheet should be made and distributed to students
prior to answering the post-lab questions.
THE MYSTERY OF LYLE AND LOUISE 5
