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Practical Experiment
C
CRM342 – Practical Experiment C
Using ALS for Evidence Detection and Collection
Materials Needed from Criminalistics Kit:
• UV light
(either short or long wavelength)
• Orange
safety viewing plate
Additional Materials:
• 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
or film)
• Notebook
and writing instrument to document findings
Descriptive/Instructions:
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.

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