Bgoffforensics Forensic Science Part Ii Hair Fiber Analysis On animals, hair types include coarse outer hairs or guard hairs, the finer fur hairs, tactile hairs such as whiskers, and other hairs that originate from the tail and mane of an animal. because hairs can be transferred during physical contact, their presence can associate a suspect to a victim or a suspect victim to a crime scene. 2. aatcc technical manual on fibers (1994) p. 48 65 3. forensic science an introduction. richard saferstein , prentice hall, 2008 4. hair and fiber analysis lab activity, wards natural science establishment, 2006 5. biodetectives: investigations in forensics. “using polarized light to identify fibers” prentice hall, 2002.
Forensic Investigation On Hairs And Fibers The transfer of hairs and fibers and their discovery as trace evidence can be critical in linking a suspect to a victim or to a crime scene. knowing how hairs and fibers can be transferred and which factors affect the significance of a hair or fiber match are important concerns of crime scene technicians, laboratory examiners, investigators, and prosecutors. The steps involved in processing fiber evidence include recovery, identification, comparison, and evaluation. in all, one of the essential aspects of forensic analysis is the examination of fibers found at crime scenes. chemical analysis of fibers can provide valuable insights into a case, helping investigators link suspects to the scene or. Trace evidence can also be gathered by tape lifting, however, this is not ideal due to the destructive nature of adhesives. samples that potentially contain fibers should be separately bagged to prevent cross contamination. references to collection and storage of fiber and hair evidence can be found in the quality documents program, laboratory. A fiber is the smallest unit of a textile material that has a length many times greater than its diameter. fibers can occur naturally as plant and animal fibers, but they can also be man made. a fiber can be spun with other fibers to form a yarn that can be woven or knitted to form a fabric.
Forensic Investigation On Hairs And Fibers Trace evidence can also be gathered by tape lifting, however, this is not ideal due to the destructive nature of adhesives. samples that potentially contain fibers should be separately bagged to prevent cross contamination. references to collection and storage of fiber and hair evidence can be found in the quality documents program, laboratory. A fiber is the smallest unit of a textile material that has a length many times greater than its diameter. fibers can occur naturally as plant and animal fibers, but they can also be man made. a fiber can be spun with other fibers to form a yarn that can be woven or knitted to form a fabric. The processing of fibre evidence in the forensic science laboratory can be divided into recovery, identification, comparison and evaluation. this article reviews each of these aspects in detail, illustrating how fibre examination has developed over the past two decades. state of the art microscopical and instrumental techniques are presented. This chapter provides an overview of the analyses that are included in a forensic fiber examination, including how fibers transfer and are collected as evidence, the instrumentation typically used in a forensic analysis of fibers, the physical characteristics and optical properties of the fibers most commonly found in forensic casework, and the.
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