CRM342 – Practical Experiment A
Sketching from Verbal Description of Crime Scene
East wall of 12573 East Locust Street, Union City, New
The east wall is 12 feet long from north to south. There are
no windows in the east wall. A large (2 feet wide by 3 feet high) painting of a
vase with flowers is in the approximate center of the wall. The northern edge
of the painting is 3 feet, 8 inches from the northeast corner of the room. The
bottom of the painting is 3 feet, 8 inches off the floor and the painting is
level. Directly below the painting is a six-drawer dresser. The north edge of
the dresser is 2 feet from the northeast corner of the room. The dresser is 5
feet long, 2 feet, 8 inches high and 1 foot, 8 inches deep. The dresser is
composed of wood material in a natural oak color. The six drawers are arranged
in two equal columns of three drawers and each drawer is 8 inches high. A
number of personal hygiene items (deodorant, cologne, a hair brush, and a pair
of nail clippers) are on the top of the dresser. A small statue of a horse is
also on the dresser. The horse is roughly centered on the dresser. In the
southeast corner of the room, on an angle, is a wicker clothes hamper. The
hamper is 1 foot, 6 inches wide, 10 inches deep, and 2 feet, 8 inches high. The
hamper is generally centered in the corner and about from both the east and
south walls at their closest points.
Adapted from D. Hayden’s (2004) Crime Scene Processing
Laboratory Manual and Workbook (Practical Exercise 1.6)
Sketching is a method of evidence preservation still used by
many police departments and crime scene units. In this assignment, you will
complete two sketches.
Sketch 1: Complete a sketch using verbal cues. Click here to
download the written instructions about the “crime scene.” Use graph paper
(preferred but not required) to sketch the scene for submission.
Sketch 2: Complete a sketch using visual cues. You will
choose either a room in your home or an outside of a building, and will use
graph paper (preferred but not required) to complete an elevation sketch for
Note: You will need to scan your sketches in order to submit
as a PDF to the Assignment box. If you cannot scan them, the next best option
is to take a high-resolution digital photograph and submit as a JPEG or other
Submit your assignment via the Assignment box no later than
Sunday 11:59 PM EST/EDT.
CRM342 – Practical Experiment B
Trace Sample Collection and Preservation
? Metal or plastic tweezers
? Four (4) sheets of paper (at least)
? High-powered or very bright flashlight
? Four (4) small coin or manila envelopes
? Tape for sealing evidence
? Two (2) small glass plates (dessert
size or dinner size)
? Two (2) butter knives
? Two (2) forks
? Camera (digital or film)
? Notebook and writing instrument to
Utilizing simple items found in most homes, you will collect
and preserve samples of physical trace
Hair: Looking through your closet, identify two items of
clothing. Visually examine the clothing with a highpowered (bright) flashlight
looking for trace hairs. Locate and collect (using a pair of tweezers) TWO (2) hairs
that do not appear to be your own. Place each hair sample in the center of a
folded piece of paper so that each sample is collected and packaged separately
for preservation. Fold the paper into four sections, being careful not to
“crush” the hair samples. Place each collected sample in individual small coin/manila
envelopes and seal each with the date/time and your initials, as well as where
it was collected and from what item/surface.
Fibers: Follow the same procedure you completed for
collecting and preserving the two hair samples. Soil: Finally, if available to
you, collect a teaspoon of soil from a known location and deposit the soil onto
a glass plate. On a separate plate, remove soil found on an “unknown” item; in
this case, use the bottom of a shoe worn by someone in your home (you can use a
butter knife to do this but use caution with any sharp objects). Using a
high-powered (bright) flashlight and a metal fork, carefully “sift” through
your known and “unknown” soil samples, notating and observing if there are any
unusual materials or similar particles present.
Photograph and document all your findings, determining
whether Locard’s Exchange Principle is evident in trace evidence collection.
Note: If you purchased the CRM230 criminalistics student
kit, you may have some of the tools necessary to collect your samples. Feel
free to use any of those tools.
CRM342 – Practical Experiment C
Using ALS for Evidence Detection and Collection
Materials Needed from Criminalistics Kit:
• UV light
(either short or long wavelength)
safety viewing plate
• One (1)
item of clothing that has been laundered with bleach/chlorine
• One (1)
item of clothing that has been laundered with soap detergent only
• Camera (digital
and writing instrument to document findings
Utilizing locations found in most homes, you will detect and
observe areas where trace evidence or biological fluids may be present.
Using the UV light and holding the orange safety viewing
plate while in a semi-darkened room, scan the item of clothing that has been
laundered with bleach. Note any luminescing areas on the clothing and document
your findings. Be as descriptive as possible, using compass directions and
other phrases to describe the specific locations at which you observe
luminescence. For example, if you observe a “stain” on the front bottom cuff of
the right pant leg, it should be obvious that (almost) everyone puts on their
pants one leg at a time, and often the right leg goes in the right pant leg and
the left goes on the left pant leg. It may be difficult for shirt tops, as some
are worn inside out or backwards. At any rate, attempt to identify the location
as best as possible and document your findings by writing what you have
observed and taking a photo if possible.
Use the UV light in the darkened room and scan the item of
clothing that has been laundered with soap detergent only. Document your findings
and photograph if possible.
Finally, as scary as it might seem for some, attempt to
detect and observe any “unknown fluids” found in the following locations of a
residence: (a) the bathroom, (b) the kitchen, and (c) the front entrance.
Document your findings and make any observations of how simple/how difficult it
was to detect any fluids of fingerprints as well as whether you were able to
photograph any of your findings.
Collection of Trace Evidence Using a Pharmaceutical Fold
• Three (3)
pieces of 8” x 11” white paper
• A black
pen or permanent marker
• Three (3)
small items, along the size of a dime
• One (1)
roll of clear Scotch® tape
• A pair of
and writing instrument to document findings
Following the example found in this module’s AVP, you will
practice collecting three (3) small items of trace evidence and securing them
in a pharmaceutical (or druggists’) fold.
With each piece of paper, draw a small 2-inch circle in the
middle. This is the “bull’s eye” where you want to “aim” placing your evidence.
Next, using a pair of tweezers to pick up a small item (which should be no
larger than the size of a dime), you will place it in the circle.
Following the directions in the AVP, you will complete the
pharmaceutical fold, and secure your packaging. In essence, you should be able
to contain the “trace evidence” in the center of the package so there is no
obvious route where the evidence can be dislodged or compromised. Once you have
made the final close on the fold, you will place a piece of tape on the area
where the open ends meet. On the taped area, you will sign your initials ½ on
and ½ off the tape areas. See the following image as an example.
This would signal an evidence technician to possible
tampering of evidence by observing if the “evidence tape” was peeled off and
placed back on after opening. When using actual evidence tape, it is designed
to tear if an attempt is made to remove the tape.
Complete this task two additional times, now collecting (1)
a small item which might contain a bodily fluid to be analyzed for a genetic
profile (such as a swab of a fluid or an item containing a fluid) and (2) a
small item which has several pieces (such as cereal flakes that have been
crushed, which can represent a controlled substance or small leafy plant).
Photograph and document your findings: Were the folds easy
to create? Was it easy to maneuver trace evidence into this type of packaging?
Should this fold then be placed in a small manila envelope? Why or why not?