Trace Evidence and the Prosecution. Mitch Poe, J.D. Tarrant County ADA Kelly L Belcher, M.S. Trace Analyst Patricia C. Eddings, B.S. Senior Trace Analyst. What is this?. Edmond Locard. 1877-1966
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Mitch Poe, J.D. Tarrant County ADA
Kelly L Belcher, M.S. Trace Analyst
Patricia C. Eddings, B.S. Senior Trace Analyst
Enthusiastic French scientist who believed that a cross-transfer of materials occurred whenever two objects came into contact with each other.
Exchange Principle - 1928
Whenever two objects come into contact there is always a transfer of material. The methods of detection may not be sensitive enough to detect this or the decay rate may be so rapid that all evidence of transfer has vanished after a given time. Nonetheless, the transfer has taken place.
Gunpowder and Gunshot Primer Residues
Ignitable Liquid Residues
Stains and “Stuff”
What is Trace Evidence?