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NCJ Number: BC000614  Add to Shoppping Cart  
Title: What Every Law Enforcement Officer Should Know About DNA Evidence
Corporate Author: National Institute of Justice
US Department of Justice
Office of Justice Programs
United States of America

National Cmssn on the Future of DNA Evidence
United States of America
Date Published: 1999
Page Count: 7
Publication Number: BC000614OH
Sale Source: National Institute of Justice/NCJRS
Box 6000
Rockville, MD 20849
United States of America

NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
Document: Text PDF 
Type: Training (Handbook/Manual)
Language: English
Country: United States of America
Annotation: This document discusses DNA evidence collection and preservation.
Abstract: DNA is contained in blood, semen, skin cells, tissue, organs, muscle, brain cells, bone, teeth, hair, saliva, mucus, perspiration, fingernails, and urine. DNA is similar to fingerprint analysis in how matches are determined. When using either DNA or a fingerprint to identify a suspect, the evidence collected from the crime scene is compared with the “known” print. If even one feature of the DNA or fingerprint is different, it is determined not to have come from that suspect. Forensically, valuable DNA can be found on evidence that is decades old. Several factors can affect the DNA left at a crime scene, including environmental factors. Not all DNA evidence will result in a usable DNA profile. DNA evidence can be collected from virtually anywhere. Only a few cells can be sufficient to obtain useful DNA information. Investigators and laboratory personnel should work together to determine the most probative pieces of evidence and to establish priorities. Every officer should be aware of important issues involved in the identification, collection, transportation, and storage of DNA evidence. Biological material may contain hazardous pathogens such as the HIV virus and the hepatitis B virus. Because extremely small samples of DNA can be used as evidence, greater attention to contamination issues is necessary when identifying, collecting, and preserving DNA evidence. When transporting and storing evidence that may contain DNA, it is important to keep the evidence dry and at room temperature. As with fingerprints, the effective use of DNA may require the collection and analysis of elimination samples. CODIS (Combined DNA Index Systems), an electronic database of DNA profiles that can identify suspects, is similar to the Automated Fingerprint Identification System where suspects can be identified or linked to a crime scene through search analysis.
Main Term(s): Evidence collection ; DNA fingerprinting
Index Term(s): Crime Laboratories (Crime Labs) ; Trace evidence ; Suspect identification ; Blood/body fluid analysis ; Hair and fiber analysis ; Forensics/Forensic Sciences
   
  To cite this abstract, use the following link:
https://www.ncjrs.gov/App/Publications/abstract.aspx?ID=204892

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