12/9/2023 0 Comments Tire tread impression evidence![]() I f a tire leaves rubber residues on the surface, as is the case with skid marks, crime scene investigators can collect these traces and compare them with the tires from a suspected vehicle. ![]() Recent advances in technology and research allow for the characterization of tire tracks by chemical analysis of the rubber. Finally, with the dimensions of the vehicle, it is also possible to determine which vehicle could have left the tracks. In addition, there are also databases that list which tires are installed from the factory on which vehicles. Once the general size and pattern of the track is determined, it is possible to consult a database of tires to determine the brand and model of the tire that left the impression. Usually, plaster of Paris is used and, if the whole track cannot be cast, the most pertinent spot is cast. Finally, if the tracks are present in relief, it is also possible to make a cast from it. In addition, if multiple tire tracks from the different wheels of the vehicle are present, it is important to make as many measurements as possible in order to determine the toe (the distance between the front of the tires and the rear of the tires on the same axle) and turning radius of the vehicle. Not only it is important to note the width, but also the circumference of the tire, if the lengths permit it. This allows for a permanent record of their class and individual characteristics. First, they need to be photographed at a 90-degree angle. When tire tracks are present at a crime scene or in the immediate vicinity, one must properly observe and record them. These characteristics may be reproduced in the tracks left by the tire, depending on the surface and the circumstances under which the track occurred. Individual characteristics include regular wear and tear as well as accidental cuts or holes. Class characteristics include size and general patterns. Tires are made of semi-hard rubber and are characterized by class and individual characteristics. Prove secondary transfer information usable in crime reconstruction.Help identify or eliminate a suspect vehicle.Provide information to identify the type or size of vehicle in question.Determine the wheelbase or turning diameter of a vehicle.If properly collected the tire tread impression is extremely valuable in proving a suspect vehicle was present at a crime scene. Tire impressions reflect the tread design and dimensional features of the individual tires on a vehicle. Almost all impressions, including partial impressions, have value for forensic comparisons How do scientists analyze tire tracks? Tire track impressions are retained on surfaces in two- and three-dimensional forms.
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