Genetic genealogist CeCe Moore appeared on WIRED's Tech Support series to discuss the application of DNA and ancestry testing in criminal investigations [1].

The intersection of consumer genetics and law enforcement represents a significant shift in forensic capabilities. By leveraging public databases, investigators can now identify suspects through distant relatives, turning family history into a tool for justice.

During the session, Moore answered questions regarding the mechanics of genetic genealogy and how these services are utilized to crack cold cases [1]. The discussion focused on the process of tracing ancestral lines to narrow down potential suspects in investigations that had previously stalled due to a lack of traditional evidence.

Moore said ancestry services provide the genetic blueprints necessary to reconstruct family trees [1]. This process allows genealogists to find common ancestors between an unknown sample and known users of DNA databases, creating a path toward a specific individual.

The conversation also touched upon notable cases where these techniques were successful [1]. By combining genetic data with traditional genealogical research, Moore and other experts can identify individuals who may have never provided their own DNA to a database, provided their relatives have.

As more people utilize commercial DNA tests for personal curiosity, the pool of available data for these investigations grows. This expansion increases the likelihood that a suspect has a relative in a database, further enhancing the efficacy of the tool [1].

“Genetic genealogy has been used to solve cases”

The use of genetic genealogy marks a transition from traditional forensic DNA profiling, which requires a direct match in a criminal database, to a broader search of familial connections. This capability allows law enforcement to identify suspects via third-party consumer data, raising ongoing discussions about the balance between public safety and genetic privacy.