By Shazleen Halim
A mysterious white
powder, a blood smear, and a moldy ham sandwich—completely unrelated items to
most. But they could be meaningful for forensic scientist,
who analyze physical evidence and samples for clues to solve
crimes. Television shows such as Bones, CSI, and Law & Order have glamorized forensic scientists and made the
field more popular, so competition can
be intense. However, if you have a strong desire to shape the world of justice
by using science to solve crime
puzzles, then a career in forensic science could be worth pursuing.
Forensic science is the application of a broad spectrum
of sciences and technologies to investigate
and establish facts of interest in relation to criminal or civil law. To become
a forensic science expert, one must
have, at minimum, a bachelor’s degree in science. Common majors include
chemistry, physics, biology, or
forensic science. About 90% of forensic chemists work in labs associated with a federal, state, or
local police department, medical
examiner’s office, or forensic services
lab. There are a few private labs that
carry out forensic analyses. They tend to have rigorous work hours, but
if you are very interested in the
field, this shouldn’t be a problem for you.
When it comes to
chemistry, this field of work relates to forensics in many ways. For example, blood analysis. Aside from being used for
identification of suspects, the contents of blood on a crime scene can be evaluated to reveal the presence of
substances. For this evaluation, a chemist
will perform a chromatography test, which uses intense heat to separate the
blood into different contents.
Afterward, a chemist determines the level of substances such as alcohol or medication that would affect the suspect’s
actions and motivation during the given crime.
Another
practice that forensic scientists do that relates to chemistry would be DNA
forensics in criminal cases. DNA
forensic is used in criminal cases to match the DNA of an individual to that of a body cell left at a crime scene, such
as skin cells, hair, and blood. The FBI most commonly uses STR- analysis for its cases. With STR- analysis, chemists
take DNA samples from areas at the
crime scene. These are then compared with the DNA profiles of individuals in an
expansive database called CODIS to
identify suspects.
The
third and final topic that forensic scientist touch on is firearms analysis or
commonly known in forensics field as ballistics analysis. Chemistry is often used in crimes involving firearms in order
to identify information from recovered bullets and residue. For example, a forensic scientist will examine a
suspect’s hands and clothes with infrared
lights to look for gunpowder residue. If this residue matches that of the
bullet found in the victim, there is
evidence that the suspect recently fired the same type of firearm responsible for harming the victim. If no gunpowder
residue is found on a suspect, a chemical analysis of the bullet can still
reveal information such as the type of firearm used and how long ago the bullet
was fired.
There
are several popular criminal cases where these chemistry-based practices were
applied. Forensic scientists are even
sometimes the reason cold cases get solved. For example, the infamous O.J Simpson case. As most of us
know, Nicole Brown Simpson and her friend Ronald Goldman were fatally stabbed on the evening of June 12th, 1994.
Although 99% of the world believes OJ
Simpson is guilty of murdering his ex-wife and her friend, one question
surrounding the case remains a
complete mystery: did two police plant DNA evidence at the scene to try and create a slam-dunk case? Detective
Furman, who was outed as a violent racist during the trials, was accused of planting OJ’s glove at the scene. Additionally, it was
proven that Simpson’s blood sample was brought to the crime
scene by a police evidence technician, and it was later discovered that the tube of blood at the crime scene only
contained 6cc of blood when 8cc had been
extracted. Simpson’s blood at the crime scene reflected DNA that had been mixed
with EDTA, a substance added to blood
taken for DNA testing. Furman pleaded no contest to charges against his person regarding this OJ “conspiracy” and is
now a convicted felon. If it wasn’t
for the work of forensic scientists and the application of chemistry, this
scheme wouldn’t have been put to
rest.
The
chemistry behind forensic science is one of the main reasons criminal cases get
solved on the daily. If it wasn’t for these chemistry-based practices used in
the forensics field, forensic scientists
would not have the material needed to complete the tasks that this occupation
has laid out for them. As a forensic
science masters graduate, I feel very honored to pursue in this field. I hope
our dear students will find what suits them best and may they be great in
whatever they pursue. That would be all from me, your forensics lecturer, Ms.
Shazleen. Thank you.