Forensic Tire Impression and Tire Track Evidence - PowerPoint PPT Presentation

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Forensic Tire Impression and Tire Track Evidence

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Tire Impressions reflect the tread design and dimensional features of individual tires on a vehicle Tire Tracks are relational dimensions between two or more tires: ... – PowerPoint PPT presentation

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Title: Forensic Tire Impression and Tire Track Evidence


1
Forensic Tire Impression and Tire Track Evidence
  • Tire Impressions reflect the tread design and
    dimensional features of individual tires on a
    vehicle
  • Tire Tracks are relational dimensions between two
    or more tires tracks can be used to determine
    the wheelbase of the vehicle

2
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3
Tread Nomenclature and Sidewall Information
4
Tread Nomenclature and Sidewall Information
  • Department of Transportation number, known as DOT
    number consists of

5
Tread Nomenclature and Sidewall Information
  • Retread tires have slightly different numbers
  • DOTR YPY 1201
  • DOTR Department of Transportation retread
  • YPY Manufacturer retread
  • 1201 date and year of manufacture

6
Tire Track Evidence
  • Tire track evidence consists of
  • Tire track width
  • Wheelbase dimensions
  • Turning diameter
  • Relative positions of turning tracks

7
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8
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9
RECOVERY
  • Tire impressions must be
  • Photographed from all angles with and without
    measurement tool (ruler)
  • Cast a 3 foot impression requires 15-25 pounds
    of dental stone
  • Measured width, length and depth
  • Direction of travel noted
  • Impressions made if possible, and
  • Pictures of the source (tire) must be included
    for comparison

10
COMPARISONS
  • Tire tread examinations compare the tire
    impressions recovered from scene with tires taken
    from a known vehicle
  • Two categories of tires
  • Suspect - Vehicle of suspect
  • Elimination - Vehicles of police, ambulance, etc
  • All tires should be seized from suspect vehicle
    for comparison

11
COMPARISONS
  • Forensic examination begins with visual
    comparison and elimination of tires which do not
    match impression
  • Forensic examination continues with full
    circumference test impressions
  • Impressions are superimposed on known impression
    over cast or original tire
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