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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4 Classifications of Evidence by Nature 1. Biological—blood, semen, saliva, sweat, tears, hair, bone, tissues, urine, feces, animal material, insects, bacterial, fungal, botanical

Blood, Semen, Saliva  Liquid or Dried  Human or Animal  Suggests a person is involved in crime  Analyzed to determine identity/origin

Fibers/Hairs  Natural (cotton)  Synthetic (nylon)  Species can be determined (w/ hairs)  Establish person was at scene

4 Classifications of Evidence by Nature 2. Chemical—fibers, glass, soil, gunpowder, metal, mineral, narcotics, drugs, paper, ink, cosmetics, paint, plastic, lubricants, fertilizer

Drugs  Any substance seized in violation of laws regulating the sale, manufacture, distribution, and use  Street Drugs or Prescription Drugs

Explosives  Any device with an explosive charge  Any object removed from crime scene that may have residues on it

Glass  Particles or Fragments  Windows with bullet holes

Documents  Handwritten or Typewritten  Source or Authenticity is Determined  Clues  Type of Paper  Ink  Indented Writings

4 Classifications of Evidence by Nature 3. Physical—fingerprints, footprints, shoe prints, handwriting, firearms, tire marks, tool marks, typewriting

Fingerprints  Visible  Plastic ( Impression)  Latent (Invisible)

Firearms/Ammunition  Guns  Bullets  Discharged or Intact

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