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NCJ Number: 34019 Add to Shopping cart Find in a Library
Title: ULTRAVIOLET DETECTION OF METAL TRACES - TRACE METAL DETECTION TECHNIQUE - FINAL REPORT
Author(s): J O RHOADS
Corporate Author: Minnesota Dept of Public Safety
State Highway Patrol
United States of America
Date Published: 1971
Page Count: 75
Sponsoring Agency: Minnesota Dept of Public Safety
St Paul, MN 55101
National Institute of Justice/
Rockville, MD 20849
US Dept of Justice

US Dept of Justice NIJ Pub
Washington, DC 20531
Grant Number: NI-71-015
Sale Source: National Institute of Justice/
NCJRS paper reproduction
Box 6000, Dept F
Rockville, MD 20849
United States of America
Document: PDF
Language: English
Country: United States of America
Annotation: THIS DOCUMENT CONTAINS THE RESULTS OF AN EVALUATION OF THIS TRACE METAL DETECTION TECHNIQUE UNDER CONTROLLED LABORATORY CONDITIONS AND THE RESULTS OF SURVEYS OF PARTICIPANTS IN FOUR WORKSHOPS HELD ON THIS TECHNIQUE.
Abstract: WITH THIS TECHNIQUE, SURFACES SUCH AS A PERSON'S HANDS OR CLOTHING ARE COVERED WITH A TEST SOLUTION, ALLOWED TO DRY, AND THEN EXAMINED UNDER ULTRAVIOLET LIGHT TO DETERMINE WHETHER THERE HAD BEEN RECENT CONTACT WITH METAL OBJECTS. IN THE LABORATORY TESTS, TEST SUBJECTS HELD METALLIC OBJECTS (PRIMARILY GUNS), FOR VARIOUS PERIODS OF TIME. THE SUBJECTS HANDS WERE TREATED WITH A TEST SOLUTION AND OBSERVED BY FOUR DIFFERENT OBSERVERS EACH OF WHOM UTILIZED FOUR DIFFERENT ULTRAVIOLET LIGHT SOURCES. THE RESULTS SHOWED THAT THE SUCCESS OF THE TECHNIQUE WAS RELATED TO VARIABLES SUCH AS LENGTH OF CONTACT, PRESSURE, AND MOISTURE. THE PERIOD OF TIME BETWEEN CONTACT AND TESTING WAS ALSO IMPORTANT. IN THE WORKSHOP SEMINARS, THE TRACE METAL DETECTION TECHNIQUE WAS PRESENTED TO 82 REPRESENTATIVES FROM LAW ENFORCEMENT IN 39 STATES. THIS REPORT CONTAINS THE RESULTS OF THREE SURVEYS OF THE PARTICIPANTS OF THESE WORKSHOPS. THE RESPONSES INDICATED THAT THE TRACE METAL DETECTION TECHNIQUE WAS FOUND TO BE OF VALUE IN APPROXIMATELY 50 PERCENT OF THE CRIMINAL INVESTIGATIONS IN WHICH IT WAS USED. THE APPENDIXES INCLUDE AN OUTLINE OF THE LABORATORY PROCEDURES USED AND RESULTS OF THE PARTICIPANT SURVEYS. (AUTHOR ABSTRACT MODIFIED)
Index Term(s): Equipment evaluation; Firearms identification; Metal identification; Questionnaires; Techniques; Trace evidence; Workshops and seminars
To cite this abstract, use the following link:
http://www.ncjrs.gov/App/publications/abstract.aspx?ID=34019

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