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NCJ Number: NCJ 235287   Add to Shopping cart   Find in a Library
Title: Statistical Evaluation of Torn and Cut Duct Tape Physical End Matching
Author(s): Frederic A. Tulleners, M.A. ; Jerome V. Braun, Ph.D.
Date Published: 07/2011
Page Count: 90
Sponsoring Agency: National Institute of Justice
US Department of Justice
Office of Justice Programs
United States of America
Grant Number: 2009-DN-BX-K235
Sale Source: National Institute of Justice/NCJRS
Box 6000
Rockville, MD 20849
United States of America

NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
Document: PDF 
Type: Report (Study/Research)
Language: English
Country: United States of America
Annotation: This study examined issues related to duct-tape physical end matching, with attention to criteria for describing the matching process, a protocol for training analysts in physical end matching, and statistically evaluating the associated error rates and overall accuracy.
Abstract: The study confirmed that it is possible to use physical end matching to identify duct tape samples as matching or non-matching. Differences between analysts, brands, tape grades, tape color, and method of separation make varying contributions to misidentifications or inconclusive results. Brand and type grade are apparently more important than color in their effect on an analyst in correctly identifying duct-tape end matches. Scissor-cut tapes are apparently more difficult to analyze than hand-torn tapes, but there is no significant different in difficulty of analysis between hand-torn tape and tape cut with a box cutter knife. Consistent tearing conditions do not seem to influence an analyst’s ability to identify duct-tape end matches. This study also showed the importance of peer review in duct-tape analysis and its ability to greatly reduce the number of misidentifications by analysts. The research examined 1,800 torn-tape specimens and 400 cut-tape specimens. The mean accuracy observed ranged from 98.58 to 100.00 percent for torn tape and from 98.15 to 99.83 percent for cut tape. The mean false-positive rate ranged from 0.00 to 0.67 percent for torn tape and from 0.00 to 3.33 for cut tape. The mean false-negative rate ranged from 0.00 to 2.67 percent for torn tape and was 0.33 percent for both types of cut tape. 64 exhibits, 10 references, a listing of venues in which the research findings have been disseminated, and appended supplementary information
Main Term(s): Criminology
Index Term(s): Evidence collection ; Evidence identification and analysis ; Evidence ; Forensics/Forensic Sciences ; Investigative techniques ; NIJ final report
   
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https://www.ncjrs.gov/App/Publications/abstract.aspx?ID=257267

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