skip navigation

Justinfo Subscribe to Stay Informed

Add your conference to our Justice Events calendar


NCJRS Abstract


Subscribe to Stay Informed
Want to be in the know? JUSTINFO is a biweekly e-newsletter containing information about new publications, events, training, funding opportunities, and Web-based resources available from the NCJRS Federal sponsors. Sign up to get JUSTINFO in your inbox.

The document referenced below is part of the NCJRS Library collection.
To conduct further searches of the collection, visit the NCJRS Abstracts Database.

How to Obtain Documents
NCJ Number: NCJ 238603     Find in a Library
Title: An Introduction to Familial DNA Searching for State, Local, and Tribal Justice Agencies: Issues for Consideration
  Document URL: PDF 
Corporate Author: US Dept of Justice, Global Justice Information Sharing Initiative
United States of America
Date Published: 04/2012
Page Count: 6
  Annotation: This overview of the science of familial DNA searching and its use in criminal investigations is intended to assist State, local, and tribal justice agencies that are currently or considering using familial DNA searching in criminal investigations.
Abstract: “Familial DNA searching” involves using CODIS (Combined DNA Index System) to search for DNA profiles that identify a biological family member of a suspect when an exact match for the DNA of a suspected perpetrator cannot be found in CODIS. This would suggest that the perpetrator is biologically related to the person whose DNA is recorded in CODIS. This information is helpful in narrowing the investigation’s focus to the members of a particular family. CODIS, however, is not designed to facilitate such familial searching. This requires States that develop familial search protocols using independently validated methods and programming. A familial DNA search is based on the number of shared genetic characteristics (i.e., alleles) and the rarity of those shared alleles in human populations. Unlike a search for a direct match, a familial search will allow for matching subsets of alleles at any given genetic markers as a basis for comparison. Because alleles in humans are inherited in a one-for-one relationship from the father or mother, close relatives of a targeted perpetrator can be expected to share more alleles, especially rare alleles, than would unrelated individuals. A familial search relies on mathematical modeling specific to the DNA database being used. This overview outlines considerations in implementing a familial search protocol.
Main Term(s): Police policies and procedures
Index Term(s): Suspect identification ; Forensics/Forensic Sciences ; Investigative techniques ; DNA fingerprinting
Sponsoring Agency: Bureau of Justice Assistance
US Dept of Justice
Office of Justice Programs
United States of America
Grant Number: 2010-MU-BX-K019
Sale Source: NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America

US Dept of Justice, Global Justice Information Sharing Initiative
810 Seventh Street, NW
Washington, DC 20531
United States of America
Type: Instructional Material
Country: United States of America
Language: English
  To cite this abstract, use the following link:

* A link to the full-text document is provided whenever possible. For documents not available online, a link to the publisher's web site is provided.