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Forensic Science

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Forensic Science Services in the Crime Lab: Physical Science Lab Chemistry, physics, geology Drugs, glass, paint, explosives, soil Biology Unit Biologists, biochemists – PowerPoint PPT presentation

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Title: Forensic Science


1
Forensic Science
  • Services in the Crime Lab
  • Physical Science Lab
  • Chemistry, physics, geology
  • Drugs, glass, paint, explosives, soil
  • Biology Unit
  • Biologists, biochemists
  • DNA, blood (stains), bodily fluids, wood, plant
    material
  • Firearms Unit
  • Firearms, discharged bullets/casings shells,
    ammo
  • Analysis of materials for GSR (gunshot residue)

2
  • Document Examination Unit
  • Handwriting/type analysis
  • Authenticity or source
  • Indented writings, other anomalies
  • Photography Unit
  • All aspects of photography
  • Digital, infrared, UV, X-ray (unseen evidence)
  • Prepares photos for court
  • Extras
  • Toxicology Unit (poisons/drugs)
  • Latent Fingerprints (hidden)
  • Polygraph Unit (interrogation)

3
  • Voiceprint Analysis Unit (telephone or tape
    analysis)
  • Crime-Scene Investigation Unit (specialize in
    evidence collection)
  • Other specializations in forensics
  • Forensic Pathology (Medical Examiners)
  • Who is the victim?
  • Injuries present
  • When did the injuries occur?
  • How were the injuries produced?
  • CAUSE OF DEATH
  • Done by autopsy
  • How is time of death determined?

4
Determining Time of Death by determining stage of
decomposition
  • Rigor Mortis Muscles spend excess ATP by
    becoming rigid (up to 36 hours)
  • Livor Mortis
  • Blood settles to low points of body for first 12
    hours after death
  • Not affected by points of constriction
  • Tell position of body
  • Algor Mortis
  • Body cools in predictable fashion until ambient
    (room temp)
  • Rule of thumb 1 -1.5 degrees per hour (norm.
    cond.)
  • Vitreous Humor Potassium is released into fluid
    of eye in a predictable fashion
  • Other amount/cond. of food in stomach

5
  • Forensic Anthropology Identification and
    examination of skeletal remains
  • Forensic Entomolgy Study of insects and their
    relationship to investigation
  • Forensic Psychiatry relationship b/n human
    behavior and legal precedings
  • Competence?
  • Profiling
  • Forensic Odentology
  • ? Teeth
  • Bite marks in cases
  • Last remaining for ID
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