Download PDF by Thomas L Bohan: Crashes and Collapses (Essentials of Forensic Science)

By Thomas L Bohan

ISBN-10: 0816055130

ISBN-13: 9780816055135

This name examines forensic situations and investigative equipment from the forensic engineering sciences, which come with the actual sciences in addition to the entire engineering fields.

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Additional resources for Crashes and Collapses (Essentials of Forensic Science)

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Even after the wheels fully lock up, the tires will not leave clear skid marks for a few feet. indd 36 12/26/08 11:44:39 AM Accident Reconstruction: Getting Started 37 ghost marks. For several reasons, one wishes to identify the point that is as close to the start of those ghost marks as is possible. This point is nearly impossible to see in photographs, which is why most at-scene investigators end up on their knees in the road peering at the skid marks from close to the pavement, often with the help of an assistant.

Because of the braking that occurred during the lag period, before full skidding began, the speed when the brake pedal was depressed would have been even higher. It is one thing to show that the hit-and-run vehicle was speeding but another to conclude that speed caused the accident. Stated differently, it is one thing to charge a driver with violating the speed laws but a different thing—and a much more serious action—to charge that driver with aggravated assault or vehicular homicide. To support the more serious charge in this case, a prosecutor would want to show at trial that the difference between the girl being struck and the girl not being struck lay with the vehicle traveling at 55 miles per hour (88 km/hr) instead of 40 miles per hour (64 km/hr).

Track width—the separation between the left and right wheels—is characteristic of the vehicle. Vehicles also can be excluded on the basis of damage since, with the exception of heavy trucks, no motor vehicle can injure a pedestrian without sustaining obvious damage itself. Needless to say, a suspected vehicle will not be excluded simply for lack of damage unless it can be established that the vehicle had not been repaired since the accident. If there is no suspect vehicle identified soon after the event, by, for example, a tip to the police, the tire and vehicle information collected at the scene will form the basis of a more painstaking, in fact tedious, search by police investigators using motor-vehicle databases.

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Crashes and Collapses (Essentials of Forensic Science) by Thomas L Bohan

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