What are the characteristics/traits of a good forensic DNA scientist?

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• What are the characteristics/traits of a good
  forensic DNA scientist?

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The Scientific Method

• A procedure used to solve problems or answer
  questions.
• A way of thinking and looking at the world.
• A technique used to gather information and reach
  conclusions.

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Steps to the Scientific Method
Observation
Hypothesis
Experiment
Conclusion
Then revise the hypothesis
If the results do not support hypothesis
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Principles of Crime Scene Investigation

• ______ Document the scene
• ______ Protect the scene
• ______ Help the victim
• ______ Search the scene
• ______ Photograph and draw location of items of
  evidence
• ______ Transport evidence to the laboratory
• ______ Package evidence

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Principles of Crime Scene Investigation

1. Help the victim
2. Protect the scene
3. Document the scene
4. Search the scene
5. Photograph and draw location of items of evidence
6. Package evidence
7. Transport evidence to the laboratory

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Search the Scene

• Goal- no stone is left unturned.
• Patterns and search strategies
• Squares and rectangles
• Concentric circles
• Pie configuration

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Presumptive vs. Confirmatory Tests

• Presumptive
• Sensitive
• Not specific
• many false positives
• Confirmatory
• Less sensitive
• Specific
• few to rare false positives

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Blood

• Presumptive
• Luminol
• Phenolphthalin
• Hemastix
• Confirmatory
• Takayama crystal test
• ABAcard Hematrace

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Luminol
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Luminol
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Hemastix
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ABAcard Hematrace
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Diffusion

• Diffusion- the spontaneous tendency of a
  substance (solute or solvent) to move from a more
  concentrated to a less concentrated area.
• T or F. Diffusion results in the uniform
  distribution of a substance.

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Spermatozoa

• Presumptive
• Ultraviolet light
• Brentamine reaction
• Confirmatory
• Christmas tree stain
• PSA or P30
• Microscopy

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P30 Analysis- ABAcard
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Male Reproductive System
Prostatic urethra
Spongy urethra
Membranous urethra
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Salivary Glands
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Saliva

• Presumptive
• Lugols reaction
• Confirmatory
• Phadebas

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Phadebas Test
Positive test
Negative test
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Fecal Material

• Presumptive
• Microscopy for undigested materials
• Edelmans Reagent UV
• Apple-green fluorescence

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Urine

• Presumptive
• UV Light
• Urea
• Litmus paper
• Creatinine
• Jaffe Test