NCJ Number
214488
Journal
Journal of Forensic Science Volume: 51 Issue: 3 Dated: May 2006 Pages: 504-508
Date Published
May 2006
Length
5 pages
Annotation
This study determined the validity and error rates of attempts to achieve fits between separated ends of duct tape (fracture match), so as determine whether they came from the same roll of tape.
Abstract
The study found that no errors (misidentifications) occurred in matching hand-torn end matches on three types of duct type. Fewer fracture matches were achieved for duct-tape ends that had been cut with scissors (81 percent compared to 92 percent). Based on these findings, the authors recommend that analysts be cautious in their conclusions about fracture matches that involve cut pieces of duct type. Jagged cuts offer the possibility of more pronounced, distinctive fits than straight cuts. Absent a definitive conclusion about a fracture match, it is necessary to use a full analysis under FBI Laboratory protocols to determine whether the pieces of duct tape can be linked based on class characteristics and the chemical composition of the components of each tape sample. Three rolls of duct tape used in the study represented different manufacturers and tape grades. Five tests varied the tape roll and/or the means of separation from the roll (hand-torn or scissor-cut). Each of four analysts received five test sets and was instructed to assess whether fracture matches existed. 5 figures, 1 table, and 7 references