Forensic Science Spring Review Part 2

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Forensic Science Spring Review Part 2
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Hair as Evidence

• Class or Individual evidence
• 1st determine if it is human
• medulla

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Ballistics

• Can determine?
• Involves?

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Entry vs ExitGSR-where and how far
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Trajectory

• 2 reference points
• Shooters location

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Forrest Fluff
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Blood Spatter

• Possible to determine
• 1st step in blood analysis

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What can we Learn?

• 1. Distance from the blood source to the target
• 2. Direction of travel and impact angles
• 3. Nature of the force used to cause the
  bloodshed
• 4. The object used to cause the bloodshed
• 5. Sequencing of multiple bloodshed events
• 6.Interpretation of contact or transfer patterns

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Blood SpatterPassive, Projected, Transferred
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Angles and Patterns
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Death and Decomposition

• Manner-homicide, natural, accidental, suicide
• Cause-heart attack, gun, strangle, drown
• Mechanism-loss of blood, air

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Algor Livor RigorMortis

• Algor mortis -loss of 1 degree of temp/hour
• Livor mortis -color begins 2 hours after death,
  permanent at 8 hours
• Rigor mortis -stiffness begins 2 hours after
  deathhead to toes about 12 hours, reverses in
  same order after 36 hours

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How longhead and trunk?Head, trunk, legs?legs
only?
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Factors that affect rigor mortis
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5 stages of decomp

• Initial decay -bugs no smell
• Putrefaction-smell
• Black putrefaction-bad smell, flattening
• Butyric fermentation-moist
• Dry decay-hair and bones

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How long?First step?How long?
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You can be anything, choose wisely
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Anthropology

• Growth plate
• Sutures
• S and L30
• C50

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Male vs Female
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Height

• Any long bone
• Femur
• Tibia
• Fibula
• Humerous
• Radius
• ulna

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Facial reconstruction
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mDNA

• YES NO

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Good Luck on Your Final Exams