What is Forensic Investigative Genetic Genealogy?
Forensic Investigative Genetic Genealogy (FIGG) uses DNA, genetic genealogy, and traditional genealogy to help investigators identify unknown individuals and develop leads in unsolved cases. By examining genetic connections to relatives and researching family relationships and historical records, investigators can narrow a search to potential individuals. Any investigative lead developed through FIGG is independently evaluated and confirmed through traditional forensic DNA testing. The use of FIGG has provided law enforcement with an additional investigative tool for cases in which traditional investigative methods have been unsuccessful in identifying an unknown individual. Recognizing the potential value of this approach, the Forensic Biology Unit established and launched its own FIGG program in July 2025.
How FIGG Works
Generate a DNA profile suitable for genetic genealogy
DNA from an evidence sample that has previously undergone short tandem repeat (STR) testing is further analyzed using single nucleotide polymorphism (SNP) testing.
Identify genetic connections
The SNP profile may be compared with genetic genealogy databases that permit law enforcement searching. The comparison may return potential genetic matches – individuals who share portions of DNA with the unknown person – which may indicate a biological relationship ranging from close to distant. Only profiles made available for law enforcement matching under the database’s policies are included in the search. Ancestry, 23andMe, and MyHeritage are not used.
Build family trees
Investigative genetic genealogists research the genetic matches using family trees, historical records, public records, and other genealogical resources. By connecting relatives across multiple generations, they work toward identifying family groups that may be associated with the unknown individual and narrow the investigation to potential candidates.
Independently confirm the lead
A FIGG investigation produces an investigative lead, not a final identification. If a potential individual is identified, a reference DNA sample may be obtained through appropriate investigative procedures and compared to the original STR profile using traditional forensic DNA testing to independently confirm the identification.
Forensic Sciences and Technology Facility
3075 Gun Club Road
West Palm Beach, FL 33406-3001
Telephone:
(561) 688-4816
