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Evidence by Nature Aim: How can evidence be classified by its nature? HW: Have a Great Weekend! Current Event Due TODAY!!!
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Crime Scene Cleaners Part 2 Gory Crime Scene Clean-Up Gory Crime Scene Clean-Up Gory Crime Scene Clean-Up
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4 Classifications of Evidence by Nature 1. Biological—blood, semen, saliva, sweat, tears, hair, bone, tissues, urine, feces, animal material, insects, bacterial, fungal, botanical
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Blood, Semen, Saliva Liquid or Dried Human or Animal Suggests a person is involved in crime Analyzed to determine identity/origin
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Fibers/Hairs Natural (cotton) Synthetic (nylon) Species can be determined (w/ hairs) Establish person was at scene
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4 Classifications of Evidence by Nature 2. Chemical—fibers, glass, soil, gunpowder, metal, mineral, narcotics, drugs, paper, ink, cosmetics, paint, plastic, lubricants, fertilizer
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Drugs Any substance seized in violation of laws regulating the sale, manufacture, distribution, and use Street Drugs or Prescription Drugs
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Explosives Any device with an explosive charge Any object removed from crime scene that may have residues on it
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Glass Particles or Fragments Windows with bullet holes
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Documents Handwritten or Typewritten Source or Authenticity is Determined Clues Type of Paper Ink Indented Writings
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4 Classifications of Evidence by Nature 3. Physical—fingerprints, footprints, shoe prints, handwriting, firearms, tire marks, tool marks, typewriting
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Fingerprints Visible Plastic ( Impression) Latent (Invisible)
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Firearms/Ammunition Guns Bullets Discharged or Intact
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4 Classifications of Evidence by Nature 4. Miscellaneous—laundry marks, voice analysis, polygraph, photography, stress evaluation, psycholinguistic analysis, vehicle identification blood spatter training blood spatter training blood spatter training
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