NCJ Number
196720
Journal
Police: The Law Enforcement Magazine Volume: 26 Issue: 5 Dated: May 2002 Pages: 24-26,28
Date Published
May 2002
Length
4 pages
Annotation
This article discusses new evidence collection tools and techniques.
Abstract
Evidence collection is one of the most important components of criminal investigation and prosecution. Technological advances in evidence collection tools allow more evidence to be located, identified, and collected. Great advances have been made in the collection and identification of DNA samples. Because of improvements in short tandem repeat technology, investigators no longer need to collect large sample sizes; now only small sample sizes are needed for DNA testing. For example, the new technology allows investigators to collect DNA samples from licked envelopes and used stamps, where only small portions of evidence remain. New alternate light source technology has also enhanced evidence collection. Alternate light source instruments produce specific wavelengths of light useful in locating evidence, including biological fluids, hairs, and fibers. However, alternate light source instruments are limited in that they only operate in dark conditions. Reflective short-wave UV imaging instruments can be operated in light and dark conditions, even outside or under bright lights. Based on the principle that different objects and substances react differently to light, a UV imaging device is particularly useful in detecting latent fingerprints. Many police departments may not be able to afford new evidence collection technology. But many of the companies loan the equipment to departments.