by georgette m hannah emily absent n.
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Biological Evidence Collection - PowerPoint PPT Presentation


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By Georgette M, Hannah & Emily (absent). Biological Evidence Collection. What is it?. Biological Evidence includes blood, saliva , hair , clothing fibres, bone and skin tissue. These are collected from a victim and are used to identify and characterise genetic factors.

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Presentation Transcript
what is it
What is it?
  • Biological Evidence includes blood, saliva, hair, clothing fibres, bone and skin tissue.
  • These are collected from a victim and are used to identify and characterise genetic factors.
  • These samples will not count as Biological Evidence if someone is being tested for drugs, poisoning or alcohol.
slide3

When collecting this evidence, it can be either swabbed with wet cotton wool or even using sticky tape.

  • Once it is collected, the evidence will then be identified to assist with the investigation.
what information can it give a scientist
What information can it give a scientist?
  • Biological Evidence can help identify potential suspects or victims to a crime scene.
  • It may also help link victims to suspects
give an example for one type of insect and how it can identify how long the victim has been dead
Give an example for one type of insect and how it can identify how long the victim has been dead
  • Insects may help to identify how long people have been dead
  • There are many different bugs that may show up on a dead body in different stages.
  • For example, a Necrophagous bug would show up almost immediately after death. These bugs help with breaking down and decomposing dead bodies.
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Blow flies will begin to a body within a few minutes of death

  • Predatory and parasitic insects feed on maggot and beetle larvae inside the body
  • As the body dries, hide beetles arrive, along withmoths to clean up whatever remains.
  • An entomologist can identify how long the body has been decomposing by what types of bugs are present.
  • Insectsare all tools that aid and entomologist in Time of Death (T.O.D.).