Forensic evidence
Download
1 / 9

Forensic Evidence - PowerPoint PPT Presentation


  • 205 Views
  • Uploaded on

Forensic Evidence. In it’s infancy…. Introduction. Today the modern police force takes for granted many of the forensic science techniques used to catch serial sexual psychopathic killers. But how did these techniques develop…. Fingerprinting….

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Forensic Evidence' - varsha


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Forensic evidence

Forensic Evidence

In it’s infancy…


Introduction
Introduction

  • Today the modern police force takes for granted many of the forensic science techniques used to catch serial sexual psychopathic killers. But how did these techniques develop…


Fingerprinting
Fingerprinting…

Fingerprinting is an important method of identifying people. This is because everybody has a unique individual fingerprint. The first person to discover that people had individual fingerprints was a man called Francis Galton in 1892. However, the first person to use fingerprinting as a system of identification in England and Wales was Sir Edward Henry in 1901.


Adipocere
Adipocere

Adipocere is the name given to hydrolysed fat. The formation of this on a body tells us that it has been in anaerobic or oxygen depleted conditions e.g. bogs, submerged locations or a lead coffin. The amount of adipocere formed can also determine how long a body has been dead.


Cold environments
Cold Environments

Soft tissue can be preserved over long periods in the frozen state. The photograph is of John Torrington who died whilst on an ill fated arctic expedition between 1845-48. As the body was well frozen, when it was eventually exhumed in 1984 his body was well preserved with the exception of the eyelids and lips.


Footwear impressions
Footwear Impressions

  • FWIs are virtually left at every crime scene – since entry/exit requires intruders to put their feet down. Peter Pan does not exist – Nobody flies – Tom Cruise is an exception in mission impossible. Not all FWIs are visible to the naked eye.


Evidence
Evidence

  • Edmund Locard was the first person to discover the value of trace evidence and its usefulness in solving crimes and convicting criminals. The rule is simple and is called ‘Locard’s Exchange Principle:

  • “Every contact leaves a trace. Criminals will always take with them a trace of something from the crime scene and will always leave behind some trace of having been there.”


Glass Fragments

Blood + spatter

Tyre tracks and FWI

Fibres – wool, nylon

What type

of evidence exists…

Insects, finger, ear

and palm prints

Hairs – human/animal

bitemarks

Cigarette ends,

Saliva = DNA

Seeds, spores related to

Specific places

Bullets, tools, knives and

screwdrivers


Luminol heme stix
Luminol/Heme Stix

  • HEMATA-STIX and LUMINOL were both developed to provide the investigator with a fast, convenient, sensitive and reliable presumptive test to identify blood at crime scenes. 


ad