|
Trace evidence is created when objects contact. Material is often transferred by heat or induced by contact friction. The importance of trace evidence in criminal investigations was shown by Dr. Edmond Locard in the early 20th Century. Since then, forensic scientists use trace evidence to reconstruct crimes, and to describe the people, places and things involved in them. Studies of homicides published in the forensic science literature show how trace evidence is used to solve crimes. Trace evidence is important in accident investigation, where movement of one part against another will often leave a tell-tale mark. Such analysis is of great use in forensic engineering. ==Examples== Examples of typical trace evidence in criminal cases include glove prints, hairs, cosmetics, Lipsticks,〔Joshi B, Verma K, Singh J (2013) A Comparison of Red Pigments in Different Lipsticks Using Thin Layer Chromatography (TLC). J Anal Bioanal Techniques 4: 157. doi:10.4172/2155-9872.1000157〕 plant fibers, mineral fibers, synthetic fibers, glass, paint chips, soils, footprints, botanical materials, gunshot residue, explosives residue, and volatile hydrocarbons (arson evidence). For such evidence to be useful, it must be compared to similar items from suspects, but particular care is necessary to ensure a thorough analysis. Ladder feet often leave a trace pattern on the ground, so showing how the ladder moved and caused an accident to the user. Skid marks from tires are often critical in determining the sequence of events before and during a car crash. Vehicular accident reconstruction relies on such marks to estimate vehicle speed before and during an accident, as well as braking and impact forces. Fabric prints of clothing worn by pedestrians in the paint and/or road grime of the striking vehicle can match a specific vehicle involved in a hit-and-run collision. Such traces are also known as "witness marks", especially in engineering and may be critical in understanding how a product failed. A typical witness mark could be an impact depression which broke a product, especially if that mark can be matched to the product which made the impact such as a hammer or nail. Such marks are also commonly encountered in criminal cases, and include bite marks, puncture marks, bullet holes etc. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「trace evidence」の詳細全文を読む スポンサード リンク
|