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Unit 23 part B
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Written during the 22/23 academic season
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Unit number and title: Unit 23, Forensic Evidence, collection and analysisLearning aim B: Investigate a simulated crime scene using forensic procedures
Assignment title: Investigate a crime scene
Introduction:
By being part of the British transport police’s scientific support unit I am working under the
label trainee forensic technician which requires such assignments such as acting as a crime
scene investigator (CSI) for the crime scene which has been stimulated that was set up by my
supervisor. To suit my supervisor’s standards I will have to document accurately and
appropriately to allow for the recording of the crime scene as well as label, package and collect
evidence and making sure that it is protected from contamination so that continuity of evidence
is present. Notes will include justifications, descriptions and evaluations of procedures that
were used to process these scenes. While attending to this task my supervisor will observe my
roles during the scene. My supervisor will then depict my skills to aid him in his decision that
looks at competence to make me assistant CSI.
This is an image that depicts
an actual forensic scene where
police cordons will use tape to
block off any potential
evidence tampering but also it
is used to keep unauthorised
personnel away.
Contents page:
Using forensic techniques to investigate a mock crime scene has the educational goal of gathering crucial
biological, chemical, physical, and other evidence. Blood, hair, fibres, saliva, semen, bones, fingerprints,
narcotics, poisons, gunshot residue, tool marks, firearms, bullets, and cartridges are among them. Also
included are documents, IT, security, records, and thorough documentation of operations and
methodologies. Contamination control, security, records, and thorough documentation of procedures and
methodologies are additional crucial investigative factors.
,B.P4: Describe the forensic methods used to process a simulated crime scene.
Evidence that was excreted by a living organism, considered important within a forensic setting
to aid investigations for the specific finding of an individual who may be considered a
perpetrator or a suspect or a victim. Evidence which is biological is compared to samples that
are controlled or databases that have been written by higher authorities to single out civilians,
this is the reason why scientists working in the forensics department make it a high priority to
label, package and store evidence with honesty. [1]
Name of the biological evidence How police will pick up that select
information.
Blood Police will first identify the type of blood,
from ranging if it is wet or dry as there are
certain procedures to which collection
occurs, for example to get a sample of wet
blood, swabbing will happen ensuring that
the swab is free from bacteria, after the
swabbing is done, it is imperial to freeze or
refrigerate it to ensure perseverance, 48hrs
after collection, testing is considered
manageable. However when looking at blood
which is dried out, photography may be used,
alternatively water that is distilled maybe
used to make the blood wet to enable
swabbing. [1]
Hairs and fibres For collection purposes, combs, tweezers or
tapes which are sterile might be used
alongside vacuums that are filtered (this
might have very low suction to conserve
evidence.) [1]
Saliva To collect saliva, swabbing will happen, to
find out information about a person testing
on the saliva will occur by using the starch
iodide test, to help find out amylase activity
and what organism it came from. To find out
if a human excreted, RSID method may be
, used and if the results are positive,
identification of a human is verified.[1][2]
Bones Police will hand pick them using gloves, to
make sure that they do not get contaminated
by markings and observations that are not
accurate. Before packaging, police will
photograph the item at the situation without
any external involvement, after this process
packaging takes place and that it is fully
labelled. [1]
Fingerprints These marks are not visible but are there, in
order for collection, marks need to be
enhanced, this can be done chemically or
black powder may be spread around the print
to further enhance them. To take the print,
crime scene lifting tape, fixation happens to
an acetate sheet that is labelled and analysis
sent. [1]
Chemical evidence:
Is evidence that fits in the chemical criteria, primarily found on humans or solutions. An
example of chemical evidence are drugs
Drug Class Inclusion of drugs Penalties that are applied
A Cocaine, heroin or crystal If the person has possession:
meth (Scientifically known as Prison sentence for 7 years, a
methamphetamine). fine which is unlimited, in
some instances both can be
applied.
If the person is dealing:
Life sentence in prison, fines
that are unlimited, sometimes
both consequences are
applied. [1]
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