NCJ Number
179036
Journal
Journal of Forensic Identification Volume: 49 Issue: 5 Dated: September/October 1999 Pages: 479-484
Editor(s)
David L. Grieve
Date Published
1999
Length
6 pages
Annotation
This report presents the methodology and findings of an experiment on the use of magnetic fingerprint powders on firearms and metal cartridges.
Abstract
A few expended semiautomatic and revolver cartridges were taken from the firing range, and some were allowed to be handled by the first officer encountered; thus, some cartridges were handled with hands not freshly washed. Others were processed without ensuring that prints would be present. Some cartridges had good prints applied by the examiner. A stainless steel revolver and a semiautomatic pistol had latent prints placed on the side plates and cylinder of the revolver as well as the slide of the semiautomatic. Magnetic and nonmagnetic powders were applied in the same manner as described in treating the cartridges. Latent fingerprints were not developed on all of the cartridges. On some, only fractional prints or ridges were developed. On those handled by the officer, some cartridges revealed latents. On those where latents were placed, excellent latent prints were developed. The magnetic powders produced the best defined prints. No problems were experienced with the use of the magnetic powder on ferrous metals. Several brand names were tried, and all worked with similar results. Of all the powders tested, the magnetic powders in black, gray, red, and green yielded the most satisfactory results. 6 illustrative photographs