NCJ Number
204669
Journal
Journal of Forensic Identification Volume: 54 Issue: 2 Dated: March/April 2004 Pages: 203-216
Date Published
March 2004
Length
14 pages
Annotation
This article discusses the use of one fluorescence and two nonfluorescence enhancements for the visualization of latent prints on adhesive surfaces.
Abstract
A latent fingerprint is almost invisible and requires some form of enhancement in order for it to be detectable. Many methods of enhancements, both physical and chemical, have been developed for visualizing such prints. Each method relies on the preferential interaction with certain constituents of the latent fingerprint, rendering it visible via coloration or fluorescence. The applicability of a method of enhancement would principally be associated with the nature of the print as well as the surface on which the latent fingerprints might be present. Adhesive surfaces offer a great challenge to fingerprint examiners. Three types of adhesive surfaces were considered in this study: transparent tape, masking tape, and black electrical tape. Thumbprints were placed onto the substrates by applying a uniform pressure, prior to the application of the respective enhancement agents. A systematic evaluation on the fluorescence emission from the enhanced latent print was carried out both quantitatively and qualitatively. The preferred excitation wavelength and the appropriate optical filtering required to enhance the visibility of the desired fingerprint evidence were identified. The visibility of an enhanced latent print was enhanced by the appropriate selection in the excitation wavelength involved in the fluorescence examination. A similar approach was carried out to analyze data obtained from enhanced latent prints on masking and black electrical tapes, and parallel findings were arrived at as in the case of the transparent tape. Fluorescent enhancement was favored as a frontline candidate in dealing with adhesive surfaces. 9 figures