Warm UP

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Warm UP

• What is Locards exchange principle?
• _________________________
• QUIZ Monday

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Crime Labs Functions of Scientists
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4 major Federal Crime Labs

1. FBI
2. DEA
3. Bureau of alcohol, tobacco, firearms and
   explosives
4. US Postal inspection service

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Services of the Crime Lab

1. Physical science unit- applies techniques of
   chemical, physical, geology to compare evidence
2. Biology unit DNA
3. firearms unit- firearms, bullets, shells
4. Document examination- handwriting
5. Photogrophy unit- examine recover physical
   evidence
6. Toxicology unit- body fluid organs to determine
   presence/ absence of drugs and poisons

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Services (contd)

• 7. Latent fingerprint unit- process and examine
  fingerprints
• 8. Polygraph unit
• 9. Voiceprint analysis unit
• 10. CSI unit- collect preserve evidence

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Details

• Biology Unit- dna, bloodstains, hairs, fibers,
  plant material
• Firearms- guns, discharge residue, weapon firing
• Documents- source of documents, paper, ink,
  writing samples
• Photogrophy- recording evidence, invisible
  information made visible.

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Functions of the Forensic Scientist

• Analyze physical data
• Determing admissibility of evidence
• Frye vs. U.S.- in order to be admitted as
  evidence at trial, the procedure, technique or
  principles must be generally accepted by a
  meaningful segment of the relevent scientific
  community
• 3. Judging scientific evidence
• 4. Providing expert testimony
• expert- education experience
• offers an opinion based on training
  evidece
• 5. Furnising training in the proper recognition,
  collection and preservation of physical evidence.

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Review!

1. Describe a piece of evidence responsible of the
   physical Science Unit
2. Describe a piece of evidence responsible of the
   the Biology unit
3. Describe a piece of evidence responsible of the
   firearms unit
4. Describe a piece of evidence responsible of the
   photogrphy unit
5. Why should a forensic chemist be willing to
   testify in court

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Case Analysis

1. Describe the primary issue of law whose
   resolution by the court was critical to the
   states ase against Dr. J
2. How did the court ultimately rule on this issue?
   Describe the main arguments supporting the courts
   decision
3. Describe the primary scientific issue raised
   during the trial. What were the defenses main
   challenges to the scientific evidence presented
   by the prosecution?
4. What do you feel wre the main issues of this
   trial? What would you have done differently or
   the same?