![]() Once collected and back in the laboratory, microscopic techniques will often be used in its examination and analysis as, for example, in the case of paint fragments or textile fibers. Typically, trace evidence is invisible to the naked eye and is collected by brushing or vacuuming a suspect surface. It may either be left behind by the perpetrator or picked up from the victim. One important source of physical trace evidence is textile fibers, which usually comes from clothing or furniture involved in the crime. ![]() Such evidence is often found in minute quantities and known as trace evidence. Similarly, he or she will often take something away with them, which can be found on a search of their person, their garment, a vehicle, or their premises. Locard's Exchange Principle dictates that evidence, both physical and biological, is to be found at the scene of a crime because the perpetrator always leaves something behind by having contact with victims and objects there. Biological evidence includes bloodstains and DNA. The most important kinds of physical evidence are fingerprints, tire marks, footprints, fibers, paint, and building materials. Physical evidence refers to any item that comes from a nonliving origin, while biological evidence always originates from a living being. One major distinction is between physical and biological evidence. Forensic scientists classify evidence in different ways and have specific ways of dealing with it. A successful crime investigation depends upon the collection and analysis of various kinds of evidence.
0 Comments
Leave a Reply. |