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NCJRS Abstract

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NCJ Number: 251477 Find in a Library
Title: NIJ and University of Central Florida Fire Research: Identifying Ignitable Liquids in Fire Debris and Providing Error Rates for Purposes of Testifying
Corporate Author: RTI International
United States of America
Date Published: November 2016
Page Count: 2
Sponsoring Agency: National Institute of Justice (NIJ)
Washington, DC 20531
RTI International
Research Triangle Park, NC 27709
Grant Number: 2008-DN-BX-K069, 2011-DN-BX-K564
Sale Source: National Institute of Justice (NIJ)
US Department of Justice
Office of Justice Programs
810 Seventh Street NW
Washington, DC 20531
United States of America
Document: PDF
Type: Factsheet; Program/Project Description; Report (Grant Sponsored); Report (Study/Research); Report (Technical Assistance); Research (Applied/Empirical)
Format: Document (Online); Factsheet
Language: English
Country: United States of America
Annotation: This paper describes a research project in which Dr. Michael Sigman and Mary Williams of the University of Central Florida developed a method for analyzing fire debris for ignitable liquids in samples that are highly contaminated with pyrolysis interferences.
Abstract: The method averages mass spectra across an entire chromatographic run. It can effectively classify ignitable liquids according to the widely accepted ASTM International classification scheme. Fire-debris analysts currently render opinions as to whether or not a fire debris sample tested positive for ignitable liquid residue without stating a known error rate for the assessment. Use of the new method, however, assists analysts in estimating an objective measure of confidence based on established statistical models. The research team developed a chemometric data analysis method to facilitate the identification of gas chromatography-mass spectral patterns associated with ignitable liquid classes. A novel method was developed based on target factor analysis (TFA) and Bayesian decision theory that classifies ignitable liquid residue in the presence of background interferences found in the debris. The testing of this new method of fire debris analysis correctly identified the presence of ignitable fluid 80-85 percent of the time.
Main Term(s): Forensic sciences
Index Term(s): Arson; Arson investigations; fire investigation; Investigative techniques; NIJ grant-related documents; NIJ Resources
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