Forensic Tire Impression and Tire Track Evidence Tire
- Slides: 11
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
Tread Nomenclature and Sidewall Information
Tread Nomenclature and Sidewall Information • Department of Transportation number, known as DOT number – consists of:
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
Tire Track Evidence • Tire track evidence consists of: – Tire track width – Wheelbase dimensions – Turning diameter – Relative positions of turning tracks
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
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
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
- Forensic tire tread evidence worksheet
- Thomas mocker and thomas stewart
- Forensic psychiatry vs forensic psychology
- What is impression evidence?
- What is impression evidence?
- Impression evidence
- Examples of impression evidence
- Patent impression
- How is tool mark impression evidence examined
- Impression evidence
- Types of tire marks
- Forensic recovery of evidence device