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forensic footwear evidence

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on 14 May 2014

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Transcript of forensic footwear evidence

how much are you paid?
how the job is done
Modern forensic scientists perform
comprehensive chemical and physical
analysis of evidence submitted by law
enforcement agencies
how samples are collected
There are several steps for collecting footprints.

First, the crime scene must be documented with photographs. Pictures of footprints must be taken at a 90 degree angle to determine the exact shoe size.

If possible, the footprint is collected as it is, for example collecting an entire sheet of paper or cardboard or wood.

If the foootprint cannot be picked up there are different lifting techniques which can be used.
who does the analysis
Evaluation and comparison of footprint evidence should be performed by a well-trained footwear examiner. Typically this person has received extensive training on footwear, evidence detection, recovery of the footprint, handling and examination procedures, laboratory and photography equipment.

This person should also be good at public speaking for courtroom testimony and legal issues.
introduction
Wherever he steps, whatever he touches, whatever he leaves, even unconsciously, will serve as silent witness against him. Not only his fingerprints or his footprints, but his hair, the fibers from his clothing, the glass he breaks, the tool mark he leaves, the paint he scratches, the blood or semen he deposits or collects.. All of these and more bear mute witness against him. This is evidence that does not forget. It is not confused by the excitement of the moment. It is not absent because human witnesses are, it is factual evidence, physical evidence cannot be wrong, it cannot perjure itself; it cannot be wholly absent, only its interpretation can err. Only human failure to find it, study and understand it, can diminish its value.
-Paul L. Kirk 1974-
forensic footwear evidence the job
conclusions and sources
what i think he meant was their is so many ways to find who the criminal was but only that this job is about the foot print, that the criminal leaves behind.
if the shoe fits table of contents
introduction slide 3
how long in college? slide 4
how much you get paid slide 5
internships slide 6
how the job is done slide 7
types of footprints slide 8
how samples are collected slide 9
lifting techniques slide 10
who does the analysis slide 11
location of analysis slide 12
sources slide 13
how long in college ?
To become a forensic scientist, you must complete a bachelor degree in this field. All forensic scientists are required to hold a bachelor degree at least. Typically, a bachelor degree takes four years to complete.
A background in math and sciences including biology, chemistry, and physics will be helpful. A composition or writing course may also be helpful. A solid education will enable you to continue your studies in college and prepare you for a career in one of the many different forensic science fields.
The starting salary in the USA is generally around $30,000. Analysts with many years of experience may make $60,000-$70,000.
internships
Internships provide students with the opportunity to experience the "real world" of forensic science and the crime laboratory. They also provide recent graduates with the relevant experience that crime laboratory directors seek from applicants. Getting an internship in any laboratory and learning about the theory behind the techniques that are employed can be helpful.
types of footprints
Visible print - a transfer of material from the shoe to the surface. This type can be seen by the naked eye without additional aids. For example, bloody shoe prints left on flooring.


Plastic print - a three-dimensional impression left on a soft surface. This includes shoe or tire tracks left in sand, mud or snow.


Latent print - is one that isn't seen by the naked eye. This type is created through static charges between the sole or tread and the surface. Examiners or investigators use powders, chemicals or alternate light sources to find these prints. Examples include shoeprints detected on a tile or hardwood floor, window sill, or metal counter.
lifting techniques for collecting footprints
Adhesive lifter - a heavy coating of an adhesive, which is a sticky substance, lifts the footprint from smooth surfaces such as tile or hardwood floors or metal counters. It is usually used with fingerprint powders.

• Gelatin lifter - a sheet of rubber with a low-adhesive gelatin layer on one side that can lift prints from almost any surface, including porous, rough, curved and textured surfaces. It is less sticky and more flexible than an adhesive lifter, allowing it to pick up a dusty shoeprint on a cardboard box, for example, but not tear the surface of the box.

• Electrostatic dust-print lifting device - a tool that electrostatically charges particles within dust or light soil, which are then attracted and bonded to a lifting film. This method is best for collecting dry or dusty residue impressions on almost any surface.
location of analysis
Footprints are collected at the crime scene.

They make prints of known shoes and sizes as a test standard. The crime scene footprints are compared to these standards in a crime lab. They can also compare collected prints to shoes of people who are possible involved in the crime.


conclusions:
Footprint analysts are forensic scientists.

Their early education involves a lot of science and math.

They need at least four years in college to earn a bachelor's degree.

They are highly trained in collecting evidence.
sources:
http://www.forensicsciencesimplified.org
google.com
http://forensictrak.com/
By: Lauren Smith
Any questi ns ?
THANK YOU FOR READING MY SLIDES ABOUT FOOTPRINT analysis

BY: Lauren Smith

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