Forensic Investigative Genetic Genealogy
What's in a Name?
Written by Jennifer Wiebe
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Genealogical DNA has been in the news a lot lately, and it isn’t clear what is implied when this vague term is used. Both Familial DNA searching (FDS) and Forensic Investigative Genetic Genealogy (FIGG) involve the use of genetic analysis and genealogy to determine relatedness, and while they are similar in that regard, they are actually very different. While FDS uses DNA in the form of Short Tandem Repeats (STR) and uses government databases to find partial first degree genetic matches (parent, child, sibling), FIGG analyzes Single Nucleotide Polymorphisms (SNP) in a DNA profile and compares it to opted-in members’ SNP profiles in public databases Gedmatch and FTDNA in order to identify genetic matches. Genealogical trees are built for those matches in an effort to identify the contributor of the unknown DNA sample. When referencing the Golden State Killer it is obvious the term “genealogical DNA” is used synonymously with FIGG, the technique used to identify Joseph DeAngelo. His highly publicized arrest in April 2018 is often referenced as the birth of the field of FIGG.
It’s important for the media to understand how this new field works so they’re able to accurately inform the public they serve. Their misuse of the term is not surprising, however, given current debate between practitioners within the field about nomenclature. The Scientific Working group for DNA Analysis Methods (SWGDAM) published an overview of Investigative Genetic Genealogy in 2020 and wrote that in addition to Investigative Genetic Genealogy, other terms being used include: forensic genealogy, forensic genetic genealogy, forensic genetic genealogical DNA analysis and searching, genetic genealogy and investigative genealogy.[1]
Forensic genealogy as a field existed long before the announcement of the arrest of the Golden State Killer in April 2018. Although forensic genealogists sometimes work with DNA, they have been doing genealogy in a legal context long before the advent of direct-to-consumer (DTC) DNA tests, since at least the 1950s. Their work includes researching genealogy for probate and estate, as well as military repatriation.[2] FIGG is also situated within a legal context, and many would argue that it is a subset of forensic genealogy.[3]
“Investigative Genealogy” was a term coined by Paul Holes, the detective for the Golden State Killer case, in April 2019.[4] This term became Investigative Genetic Genealogy (IGG) and was adopted by prominent members of the field. It became the default term for work done to provide an investigative lead to support the identification of the donor of unknown DNA from a suspect in a criminal case or for unidentified human remains (UHR). Some practitioners, however, consider the forensic context of the analysis of genetic information warrants inclusion of the word “forensic” and began to call it Forensic Genetic Genealogy. A review article by Kling et al. in 2021 states that the two terms are synonymous.[5]
Some liked the use of the word “investigative,” and since it helped to further distinguish it from Forensic Genealogy, began to call it Forensic Investigative Genetic Genealogy (FIGG). In the February 2022 ISHI newsletter, Dr. Claire Glynn, Associate Professor & Founding Director of the Graduate Certificate in Forensic Genetic Genealogy at the University of New Haven, states that combining the terms FGG and IGG “highlights and reinforces the fact that this technique utilizes both forensic and investigative processes and it is hoped this satisfies all interested stakeholders.”[6]
However, an October 2022 article by Gurney et al, states that the term IGG is used “to distinguish IGG from the forensic sciences.”[7] The authors make the argument that unlike forensic science, practitioners of IGG are not trained scientists, do not work in laboratories with all their included equipment and chemicals, do not act as expert witnesses and most importantly, their findings are not used as evidence of guilt, but only as a lead for law enforcement to investigate. The compromise proposed by Dr. Glynn does not appear to satisfy all interested stakeholders.
“What's in a name? That which we call a rose by any other name would smell just as sweet.”
Photo credit: Jennifer Wiebe
To add to this confusion, the United States Department of Justice (DOJ) in their interim policy calls it “Forensic Genetic Genealogical DNA Analysis and Searching (FGGS)”.[8] The DOJ policy uses the term “forensic genealogy” to refer to the use of DNA analysis with traditional genealogy research, either with STRs or SNPs, and FGG to refer to the use of SNPs specifically, in addition to the type of databases used. Maryland, the first state to regulate the use of FGGS, also uses this term in its legislation, similarly defining it by its use of SNPs and particular databases.[9] The relevance of the term “forensic” is consistent in both the policy and the legislation. Regardless, the expectations for use of genealogical evidence in the judicial process remains unclear. Will practitioners be required to act as expert witnesses? In 2019, defense lawyers made a motion for discovery in the People of the State of California vs. Roy Charles Waller. The defense argued for their right to know the “familial searches of the private genetic genealogy databases as well as the genetic genealogy company or companies that have been involved and all the reports and communications with them.”[10] Ultimately, the judge agreed with the idea that the genetic genealogy work is just an investigative lead, and like many tips that law enforcement receive that do not end up in a courtroom, is not relevant and therefore should not be made available to the defense, potentially establishing precedence.
Regardless of whether genealogical evidence is merely for investigative purposes and cannot be used as proof in court, situating the field under the umbrella of forensic science remains important. As Machado and Silva point out in their February 2022 article, quality assurance and standards in the field need to be addressed. Given that “STRs used in traditional forensic DNA analysis are generated by accredited forensic laboratories that must comply with a host of quality assurance standards and requirements,”[11] shouldn’t the work done by forensic genetic genealogy service providers for FIGG also be required to follow these standards? John Butler’s 2023 review article offers many examples of guidelines and policy to draw upon.[12] The recent establishment of working groups to address this is promising in that regard.[13]
Further, while the proponents of IGG are working on a board for accreditation of investigative genetic genealogists, their proposal highlights another reason as to why they do not wish to be under the forensic umbrella. The board claims the work is not analogous to any existing fields, including forensic science, in support of movement towards self-regulation. Their argument is that although existing quality assurance standards can easily transfer from accredited labs that do STR testing to labs that do SNP testing, given that the work that genetic genealogists do is very different from the work done in labs, the same standards do not hold.[14] However, many standards and guidelines currently exist that would be compatible with genetic genealogy, including data security, privacy, training, and codes of ethical conduct.[15] Policies that emphasize transparency are also important, given that it is a vital aspect of promoting public trust. Drawing from currently available guidelines, policy and best practices developed from well-established organizations and working groups not only avoids recreating the wheel, it demonstrates FIGG practitioner commitment to high standards of proficiency and quality control, and increases confidence in the reliability of work products.
The name of this field isn’t just relevant to English. As Scudder et al. point out in their 2019 article, “the technique has an international and cross-border element.”[16] When matches in the databases can come from around the world, it is necessary to develop a vocabulary to talk about this field in all languages. Tillmar et al. published a case study of a 16 year old double murder that was solved in Sweden.[17] An article referencing this, published by the Swedish Chemical Society, refers to the technique as “rättsgenetiska släktforskningsmetoder”[18] which translates to forensic genetic genealogy methods. A Spanish article refers to it as “genealogía forense” (forensic genealogy) or “genealogía genética investigativa” (investigative genetic genealogy).[19] As jurisdictions around the world begin to regulate this technique, following the regulations in cross-jurisdictional cases requires knowing that they are referring to the same methods. Scudder pointed out in his presentation at ISHI 33 that the language issue remains relevant even if the regulations are written in English. For example, the Gedmatch PRO terms of service give an example of a violent crime that is eligible for upload to their database as “aggravated rape.” This may not be a term used by various jurisdictions and it may be necessary to clarify this to be consistent with the terms of service.[20]
In the end, the name debate may not matter. What the field will be called as defined in legal and regulatory contexts will certainly influence the name. More likely, what the media calls it will enter public consciousness, and the shorter “forensic genealogy” may win out, making the rationales for the various terms moot. However, regardless of whether FIGG practitioners will be able to testify in court or will be regulated like the forensic sciences, continuous development and rigorous commitment to standards and best practices is necessary.
[1] “Overview of Investigative Genetic Genealogy,” SWGDAM (https://www.swgdam.org/_files/ugd/4344b0_6cc9e7c82ccc4fc0b5d10217af64e31b.pdf : accessed 27 January 2023).
[2] “Forensic genealogy,” ISOGG Wiki (https://isogg.org/wiki/Forensic_genealogy : accessed 27 January 2023).
[3] “Investigative genetic genealogy FAQs,” ISOGG Wiki (https://isogg.org/wiki/Investigative_genetic_genealogy_FAQs : accessed 27 January 2023).
[4] Tara Luther, “To Catch a Predator: An Interview with Paul Holes,” The ISHI Report (https://promega.foleon.com/theishireport/april-2019-final/to-catch-a-predator-an-interview-with-paul-holes/ : accessed 27 January 2023).
[5] Daniel Kling et al., “Investigative genetic genealogy: Current methods, knowledge and practice,” Forensic Science International: Genetics 52 (2021), 102474.
[6] Claire L. Glynn, “The Development of a University Educational Program in Forensic /Investigative Genetic Genealogy to Meet Industry Needs,” The ISHI Report (https://promega.foleon.com/theishireport/the-ishi-report-february-2022/development-of-a-figg-educational-program/ : accessed 27 January 2023).
[7] David Gurney et al., “The need for standards and certification for investigative genetic genealogy, and a notice of action,” Forensic Science International 341 (December 2022), 111495.
[8] “2019 Interim Policy: Forensic Genetic Genealogical DNA Analysis and Searching,” United States Department of Justice (https://www.justice.gov/media/1025866/dl?inline=#:~:text=FGGS%20is%20a%20law%20enforcement,nature%20of%20any%20genetic%20association : accessed 27 January 2023).
[8] “2019 Interim Policy: Forensic Genetic Genealogical DNA Analysis and Searching,” United States Department of Justice (https://www.justice.gov/media/1025866/dl?inline=#:~:text=FGGS%20is%20a%20law%20enforcement,nature%20of%20any%20genetic%20association : accessed 27 January 2023).
[9] “Forensic Genetic Genealogical DNA Analysis and Search (FGGS) Data Definitions and Reporting Guide,” Maryland’s Office of Crime Prevention, Youth, and Victim Services (http://goccp.maryland.gov/wp-content/uploads/Forensic-Genetic-Genealogical-DNA-Analysis-and-Search-FGGS-Data-Definitions-and-Reporting-Guide-.pdf : accessed 27 January 2023).
[10]“Motion for Discovery, People of the State of California vs. Roy Charles Waller, Oct 7 2019, case no: 18FE018342,” Superior Court of California, County of Sacramento (https://meshbasestorage.blob.core.windows.net/dnacontainer/Waller-Court-Ruling.pdf : accessed 27 January 2023).
[11] Helena Machado and Susana Silva, “Investigative Genetic Genealogy: An Ethical and Privacy Assessment Framework Tool is Needed,” Forensic Science Review 34 (2022), pp. 17+.
[12] John Butler “Recent advances in forensic biology and forensic DNA typing: INTERPOL review 2019-2022.” Forensic Science International: Synergy 6 (2023) 100311
[13] Matthew J. Gamette et al., “Establishment of the National Technology Validation and Implementation Collaborative (NTVIC) and Forensic Investigative Genetic Genealogy Technology Validation Group (FIGG-TVG),” Forensic Science International: Synergy (January 2023)
[14] Gurney et al., “The need for standards.”
[15] “Ethics, guidelines and standards,” ISOGG Wiki (https://isogg.org/wiki/Ethics,_guidelines_and_standards : accessed 27 January 2023); see also “2019 Interim Policy,” United States Department of Justice and “Overview of Investigative Genetic Genealogy,” SWGDAM.
[16] Nathan Scudder et al., “An international consideration of standards-based approach to forensic genetic genealogy,” Forensic Science International: Genetics Supplement Series (2019).
[17] Andreas Tillmar et al., “Getting the conclusive lead with investigative genetic genealogy — A successful case study of a 16 year old double murder in Sweden,” Forensic Science International: Genetics (2021).
[18] Erika Lindbom Sierakowiak, “Rättsgenetik: “Vi utnyttjar att alla har tusentals släktingar,”” The Swedish Chemical Society
(https://kemisamfundet.se/rattsgenetik-tusentals-slaktingar/ : accessed 27 January 2023).
[19]Óscar García, “Genealogía forense. Implicaciones sociales, éticas, legales y científicas,” Spanish Journal of Legal Medicine, volume 47, issue 3 (July - September 2021), 112-119.
[20] Michelle Taylor, “Forensic Genetic Genealogy Needs International Cooperation,” Forensic (https://www.forensicmag.com/591618-Forensic-Genetic-Genealogy-Needs-International-Cooperation/ : accessed 27 January 2023).