forensic

1. FORENSIC 3
Abdul Raffi M. Usman, BSCrim

2. Paraffin Test
and
Gun Power Residue

3. A paraffin test is a method of finding
gunshot residue (GSR) on the hands of
a possible shooting suspect. The tester
will dip the suspect’s hands in a sort of
melted wax.
Paraffin Test
(Dermal Nitrate Test)
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When the wax has had time to cool, the
suspect is left with lovely white wax
gloves. The wax is then peeled off the
hands, and examined for flecks of
evidence that he has shot a firearm
recently.
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Gun Power
Residue
Also known as cartridge discharge residue
(CDR), or firearm discharge residue (FDR), is
residue deposited on the hands and clothes of
someone who discharges a firearm. It is
principally composed of burnt and unburnt
particles from the explosive primer, the
propellant—and possibly fragments of the
bullet, cartridge case, and the firearm.

5. Basic
Toxicology

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Toxicology
Toxicology is the study of the adverse
effects of chemicals or physical agents
on living organisms.
A toxicologist is a scientist that
determines the harmful effects of
agents and the cellular, biochemical,
and molecular mechanisms
responsible for the effects.
Toxicant, toxin, and poison are often
used interchangeably in the literature;
however, there are subtle differences.
Toxic substances may be systemic
toxins or organ toxins.

7. MACRO
ETCHING

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The macro etch
test is commonly
used to qualify fillet
weld procedures
and welders.
In this test, the
coupon is cut
transverse to the
weld axis in one
or more locations.
MACRO ETCHING is a procedure for revealing the large-scale
structure of a metallic specimen, that is, structure visible with the
unaided eye, by etching an appropriately prepared surface. The
procedure is used in process metallurgy as both a quality-control tool
and an investigatory tool.

9. ULTRAVIOLET

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ULTRAVIOLET
• Ultraviolet (UV) light allows investigators and forensic
researchers to examine clues and recover evidence that
could not have been previously detected.
• UV light provides more detail and contrast to an injured
area, including bite marks, than standard lighting
techniques. There are two techniques for UV photography.
In one method, known as reflective UV imaging, the
wound is flooded with UV light, and the reflected UV
image is photographed.

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THANK YOU!