recreating death’s half acre: forensic science and tech farm dr. david k. mills louisiana tech...
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Recreating Death’s Half Acre:Forensic Science and Tech Farm
Dr. David K. MillsLouisiana Tech University
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Forensic Science at Louisiana Tech University
• A Brief History
• Coursework
• Research Activities
• Future Directions
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Forensic Science
What is it?
Components-Applied Science
Basic Science
Legal/Courts & Testimony
Facilities
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Scope of Forensic Science
Criminalistics
Specialities
Medicine
Anthropology
Odontology
Entomology
Others
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History of Forensic Science
Chinese medicine-6th Century
1839-MJB Orfila, toxicology
Late 1800s-Alexandre Lacassagne, ballistics and bloodstain patterns
1910-Edmund Locard, exchange principle
1924-August Vollmer, LAPD crime lab
1932-FBI Laboratory, fingerprints
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Forensic Science is NOT
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Forensic Science is
• CS Investigators• Physical Evidence• Forensic Science• Forensic
Taphonomy• Forensic
Archeology
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Forensic Anthropology at Louisiana Tech University
Integrating Field Investigations with Laboratory Analysis
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Coursework in Forensic Science
• Forensic Anthropology
• Biological Anthropology
• Research in Forensic Anthropology
• Readings in Forensic Science
• Readings in Bioanthropology
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Human Osteology Lab
• Intense instruction in human osteobiology
• Methods used in human identification
Objectives
AgingSexingPopulation AffinityDietPathologyTrauma
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Investigative Field Techniques
• Simulated Crime Scenes
• Pics as model corpses
• Forensic Taphonomy
• Forensic Archeology
• Moot Court
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Crime Scene Excavation
• Site survey and discovery• Crime scene preservation• Site formation processes• Site excavation
• Forensic archeological methods • Importance of context and the chain of evidence• The art of archeology
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Recovery and Analysis
• Recovery of material artifacts• Data recording• Forensic photography
• Preservation of skeletal remains• Preliminary field analysis• Curation and transport
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Investigative Field TechniquesForensic Archeology
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Laboratory Analysis and Reconstruction
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Mock Inquest
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Mock Inquest
• Each forensic team submits a written forensic case report.
• Students portray expert witnesses and defend their conclusions.
• Afterwards, crime scenario is presented and compared to forensic team findings.
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Model Human Corpse
• Hormel pygmy pig is used as a model human corpse
• Document arthropod succession is used to determine post-mortem death interval
• Patterns of decomposition and disarticulation are documented
• The model corpse is used for other research purposes (e.g. studies in taphonomy)
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Forensic Entomology
• Model corpse is placed in secured cage surrounded by dead fall traps
• Sampling will begin when first blow fly lands
• Students prepare experimental area in environment A
• Two entomology groups sample, monitor and analyze arthropod and tissue samples
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• Traps are sampled at set times in morning and afternoon.
• Temperature, rainfall and other climatic variables are measured.
• Arthropods are sorted and counted.
• Arthropod taxonomy is identified, and succession is determined.
• Tissues are fixed and processed for paraffin embedding and stained.
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Research Activities inForensic Taphonomy
• Bioturbation• Cut mark analysis• Differentiating bone trauma from geofact• Cell and tissue decay• Site formation processes• Chlorophyll concentration as PMI indicator• Hydraulic transport and differential preservation
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Image Analysis and Forensic Anthropology
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Bone Modification