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Accession Number PB2013-103825
Title Application of Fluorescence Line Narrowing Spectroscopy to Forensic Fiber Examination.
Publication Date 2012
Media Count 144p
Personal Author A. D. Campiglia M. D. Sigman
Abstract We propose to develop nondestructive analytical methodology capable of providing highly discriminating identification of textile fibers encountered as physical evidence in criminal investigations. Trace textile fiber evidence is found at numerous crime scenes and plays an important role in linking a suspect to the respective scene. Several methods currently exist for the analysis of trace fiber evidence. Microscopy based techniques are important tools for discriminating fibers with at least one distinguishable characteristic. The main advantage of these techniques is their non-destructive nature, which preserves the physical integrity of the fibers for further court examination. When fibers cannot be discriminated by non-destructive tests such as those based on microscopic, optical and physical examination, the next reasonable step is to extract the dye from both the known and questioned fiber for further chemical analysis. Many cases exist where the comparison of fibers based on the chemical composition of dyes still leaves the forensic scientist with the difficulty of assigning a probability to the common source determination. The problem stems, in part, from the large amounts of textile produced each year in replicate fiber types and colors. This problem is made more difficult by the fact that it may not be possible to discriminate between two fibers that have been dyed with highly similar dyes. This is not an uncommon situation, as there are many hundred of commercial dyes with indistinguishable colors, and minimal structural variations are encouraged by the patent process and commercial competition. The end purpose of this project is to fulfill this gap with a highly discriminating identification tool that maintains the evidentiary value of the original sample. We focus on the total fluorescence emission of fibers.
Keywords Chemical analysis
Chemical composition
Criminal investigations
Criminal justice
Forensic science
Trace evidence

Source Agency Office of Justice Programs.
NTIS Subject Category 91C - Fire Services, Law Enforcement, & Criminal Justice
43D - Police, Fire, & Emergency Services
57F - Cytology, Genetics, & Molecular Biology
71I - Fibers & Textiles
Corporate Author University of Central Florida, Orlando. Dept. of Chemistry.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1309
Contract Number 2006-DN-BX-K036

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