NCJ Number
81320
Journal
Detective Volume: 8 Issue: 2 Dated: (Fall/Winter 1981) Pages: 14-17
Date Published
1981
Length
4 pages
Annotation
Types of gunshot residue testing and kits are described, based on information collected by the U.S. Army Criminal Investigation Command (USACIDIC). The article focuses on a type of gunshot residue test that attempts to detect primer residue and is aimed at identifying the person or persons who fired the weapon.
Abstract
To determine whether or not a subject has handled or fired a weapon, this testing involves checking for antimony and barium, the two metallic elements often found in primer mixtures. The U.S. Army Laboratory used the atomic absorption method to analyze gunshot residue. The USACIDC-issue collection kit is used to collect the residue for transmittal to the lab. Two brands of kits are available; both contain a set of instructions and all the items necessary to swab the subject's hands, as well as the proper analytical controls. Persons using the kits should remember not to touch the swabs to anything except to the acid solution and to the object being swabbed as contaminants are present. They should avoid touching the dispensing end of the acid vial to anything, and use the same hand for all 'clean chores' such as swabbing. Except for suicides, if less than 6 hours have elapsed since the shooting, the gunshot residue collection should be performed regardless of most other circumstances. After 6 hours, trace metal detection tests should be conducted. The reliable results from gunshot residue tests require expediency and care. Photographs and instructions for the use of a gunshot residue collection kit are included.