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Forensic Examination of Cable Ties

NCJ Number
215686
Journal
Journal of Forensic Identification Volume: 56 Issue: 5 Dated: September-October 2006 Pages: 744-755
Author(s)
Michael E. Gorn; Pam S. Hamer
Date Published
September 2006
Length
12 pages
Annotation
Based on two case studies in which cable ties (plastic strap fasteners used for many household and industrial purposes) were used to bind apparent crime victims, this paper describes how cable ties are manufactured, what to look for when ties are compared, and possible conclusions from such comparisons.
Abstract
In describing the manufacturing process for cable ties, this paper focuses on the procedure of one cable tie company. Other companies may use different manufacturing techniques and procedures; however, the points of comparison for cable ties should remain the same. A comparison of two ties begins with an examination of their physical characteristics (e.g., the shape of the clasp, color, length, and width). This is followed by a comparison of the manufacturer information transferred to the tie from marks etched into the mold; this may include the company name and mold number. Additional microscopic comparisons can then be performed on two ties that have the same mold number. When comparing two ties, it is necessary that they have the same mold number. Otherwise, only a comparison of physical characteristics and manufacturer markings can be performed. If the mold and pin details match between two same-numbered ties, the forensic analyst can conclude that they were manufactured in the same mold and before any of the pins were removed and replaced. If two same-numbered ties match in mold detail but exhibit differences in pin features, then the two ties were manufactured in the same mold but at different times. If there are differences in mold and pin detail between to ties with the same number, then the manufacturer has more than one mold with the same number. If necessary, depending on the investigative questions, a manufacturer or distributor inquiry may be required. The application and outcome of these procedures in each of the two case studies is described. 9 figures and 1 reference