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How are tire tracks used in a criminal

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Rayana Meyers

on 12 March 2014

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Transcript of How are tire tracks used in a criminal

found in places with mud, snow, dirt, sand, or on a victim's clothing
Tire impressions are the tread design and dimensions of a tire.
Tire tracks can be latent prints which cannot be seen by the naked eye and require chemicals or powders to be seen
Tire tracks can be visible prints which can be seen by the naked eye without any additional aids
Tire tracks can be plastic prints which are three dimensional prints left behind by tires.
When and Who?
There are grooves, slots, sipe, and a tread wear indicator in a tire which helps identify the car
this forensic technique was first invented in 1930 by David Chapman

Tire tracks are used to help prove the identities of a person at a crime scene
David Chapman
Invented this forensic technique in 1930
Brief History
Tire tracks can hold clues to
where the car had been before like glass,sand,soil,grass and
other substances between
the treads

Tire tracks reveal the vehicle used in the crime
Description of Evidence
skidding patterns can
determine the vehicle used in the crime
If the surface is hard, such
as road pavement, the tire
might still leave a trace, if
dirt or dust was present

Tire tracks need to
be photographed at a
90-degree angle

Student will learn how tire tracks are used in a
criminal investigation.
How It Is Used
tire tracks are collected by lifting, photographing, casting, or collecting cloths from the victim
tire tracks are used in hit and run and other road traffic offenses
tire tracks can determine the age and model of the car
They put markers around the tire tracks which have measurements on them and often take both photos or imprints to take back to the lab and then put them through a data base which enables them to pinpoint the vehicle
Class Characteristics can be used to eliminate a suspected tire or suggest a tire could have made the track
The tracks are carefully measured
with the dimensions of the vehicle, it is also possible to determine which vehicle could have left the tracks
Techniques and materials for lifting, casting and chemically enhancing impressions will be practiced
Casts can be made of 3D impressions
The End!
law enforcement officers and
crime scene investigators use tire
tracks to help solve crimes

The most common use of tire tracks in forensic investigations occurs in road accident scenes, or in the access and escape routes of criminal activity
Found in places with high levels of water
Class characteristics of a tire include size, tread design ,and wear marks
Tire tracks are often overlooked
OE tires are sold on new cars
Replacement tires are bought to replace old worn down tires
by further investigations, defects and wear on a tire tread caused by nails, gravel, patches and alignment problems can be found
Full transcript