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Unit 23 part A
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Hamza SheikhUnit number and title: Unit 23: Forensic evidence, Collection and Analysis.
Learning Aim A: Understand how to gather forensic evidence, the integrity to forensic
investigation and the importance of health and safety.
Assignment title: Gathering and preserving forensic evidence.
[1]
Contents page:
At the crime scene: personnel and their roles.
Scientific support at the crime scene –
Structure of Scientific Support Units (SSU).
Authorised personnel at the scene: first attending officer (FAO), (SOCO)/(CSI), crime scene
manager, police officers, paramedics, fire and rescue service officers, forensic scientists.
Preservation and recovery of evidence
Restriction of the scene and restriction of access.
Observation and recording of the scene, identifying and targeting evidence.
Documenting and recovering trace materials:
Characterisation and comparison.
Marks and impressions.
Prevention of contamination.
Methods of collection,
Packaging and labelling, to include paper bag versus plastic bag, and knife tubes.
Storage and transport of a variety of materials while preserving the integrity of the evidence.
, Hamza Sheikh
Continuity of evidence.
Route of evidence: SOCO, SSU, forensic laboratory, court.
Search patterns
Health and safety such as health and Safety at Work etc Act 1974 and subsequent updates
A.P1 and A.M1:Explain the structure and importance of Scientific Support Units and
authorised personnel to forensic investigations.
Introduction:
Forensic science is frequently used in the criminal justice system. Forensic scientists collect and
analyse evidence from crime scenes and other sites in order to produce objective results that can
aid in criminal investigation and prosecution, or exonerate an innocent person.
What is a crime scene?
A crime scene is any location where a crime or infraction has been committed. In order to solve
the case, authorised people and forensic investigators are required in this area. This evidence
can be biological, physical, or chemical in nature.
Scientific support units:
The SSU is in charge of forensic analysis and identification of seized materials, as well as
supporting police in obtaining critical crime scene DNA. They preserve and evaluate biological,
physical, and chemical evidence such as blood, sperm, saliva, fibres, hair, narcotics, and
combustible substances to verify that it is not tainted. Based on their examinations, they provide
reports and outcomes that are admissible in court and used in cases. Based on their findings,
several SSU members may be called to testify.
Scientific support units are vital because they identify scientific evidence that could lead to the
arrest of a suspect. They collect biological evidence containing DNA for use in court. DNA can
be used to incriminate someone in court.
, Hamza Sheikh
In a crime scene, many authorised personnel attend the crime such as:
Authorised personnel Example of reason for access
Crime scene managers During the evidence collection phase, they
will manage the SOCO/CSIs team by telling
them concrete plans which should be upheld
in the first phase but also provide
contingency plans if there are any confusions
or risks.
Their importance: On top of this role they
may give senior investigating officers advice
for their planning of forensic investigative
strategies for the scene of the crime.
Moreover, they can be used to help seek out
future opportunities for colleagues to develop
abilities within the force and threats to obtain
the force’s objective by providing a detailed
analysis into how to control the risk while
having the service quality improved. [2] [3]
Police officers Collecting the eye witnesses’ statements, they
have the ability to give their contact details
along with information which was passed on
by a leaflet if the victim has contacted them.
Their importance:
Additionally a judgement is passed by them
as they will have a grasp of the certain
investigation they need to carry out, in more
serious circumstances a detective may be
called in to assist, their role is to give special
warning if needed and risk assessments will
be conducted. [2] [5] [6]
Forensic scientists If evidence is related to their specialised area
such as that of a pathologist they may be
called in. Their job role consists of recording
findings from the scene of the accidents or
crime. Their importance: They also work in
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