Lab Report, Physics including Earth and space sciences
Tool mark Examination Physical Criminalistics
There are 3 files in attachments about:
1- What I did in the lab in detail.
2- A lecture from the university about tool marks and footwear.
3- Practical sheet.
Please write the: aims from this experiment, Introduction, Methods, Results, Discussion, Conclusion and 7 Referencing (Harvard system) and, Answer these questions in a separate part.
1. Why is the analysis of tool mark characteristics a useful form of evidence?
2. During visual examination with the microscope, describe how you can improve the amount of contrast on the observed image (i.e. to make indentations and marks on the tool or cast more evident).
3. Describe how a tool mark found on a window frame at a point of entry can be collected from a crime scene.
Marking Scheme for Lab reports-Physical Criminalistics
Aims: 5 Marks
Introduction: 20 Marks
Methods: 10 marks
Results: 10 Marks
Discussion: 35 marks
Conclusion: 10 Marks
Referencing: 10 Marks
Tools are commonly used to gain access into buildings or through fences and gates.
Tools can leave marks behind when they are used. Matching the characteristics
found on such marks is a
You will be provided with a selection
of tools commonly encountered in crime scene
investigations. A cast of
from a crime scene
in order for you to determine which of th
marks labelled A
both macroscopically and microscopically using a
and makes notes of
In order to do
a true comparison, you will need to make casts of the sele
ction of tool marks yo
have been given. Remember
tool marks are an inversion of the tool that made them
if only a cast of the tool mark is recovered from the scene then any test marks
made from a suspect tool in the lab will have to be compared using
casting as well.
The most difficult aspect of tool mark comparison is that using the tool at different
angles will make different marks.
les it could
have been made from.
put the to
ols in contact with the
casts. Such an action would make the casts
inadmissible as evidence.
e, size, blade angle
, wear and tear
present on the tools
(e.g. paint, glass, grease
Look carefully for any class, sub
class and individual characteristics and make
tches showing their position on
scene mark and any test marks you
t marks obtained correspond to the scene mark?
1. Why is the analysis of
mark characteristics a
useful form of evidence?
2. During visual examination
with the microscope
w you can improve the
amount of contrast on the observed image (i.e. to make indentations and marks on
the tool or cast more evident).
how a tool
mark found on a window frame at a point of entry can be
collected from a crime
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