Concerns Associated with Expanding DNA Databases

Andrea Roth · Volume 6, Issue 2 (2014)

By 2014, the FBI’s Combined DNA Index System (CODIS) contained over 11 million offender profiles and 2 million arrestee profiles. Andrea Roth’s article arrived at a critical moment: states were rapidly expanding the categories of individuals required to provide DNA samples, and the legal framework had not kept pace.

The Constitutional Question

At the heart of Roth’s analysis is the Fourth Amendment. The Supreme Court’s decision in Maryland v. King (2013) had upheld the collection of DNA from arrestees as a reasonable search. But Roth argued that the majority opinion left critical questions unanswered: What about familial searching, where a partial DNA match is used to identify not the individual in the database but their relatives? What about the retention of genetic material beyond the initial identification purpose?

Familial Searching and Genetic Surveillance

The paper dedicates substantial analysis to familial DNA searching — a technique that effectively places entire families under genetic surveillance when a single member’s DNA is in the database. Roth demonstrates that this practice disproportionately affects communities that are already overrepresented in the criminal justice system, creating a form of inherited genetic suspicion that raises profound equal protection concerns.

Expanding Collection, Expanding Risk

Several states had moved to collect DNA from individuals arrested for misdemeanors, not just felonies. Some proposed collecting DNA at birth or from all residents. Roth methodically examines each expansion scenario, weighing the investigative benefits against the privacy costs and the risk of false matches — a risk that grows as databases expand and partial-match searches become more common.

Impact and Relevance

This article has been cited by courts, policy organizations, and advocacy groups working on genetic privacy issues. With the continued growth of both law enforcement DNA databases and consumer genetic testing services, the questions Roth raised have only become more urgent. The Golden State Killer case in 2018, which used consumer genealogy databases for identification, brought many of these issues into mainstream public awareness.

The Technology Outpaces the Law

Rapid STR analysis, portable DNA sequencers, and the declining cost of genetic testing have accelerated database expansion beyond what policymakers anticipated. When CODIS was established in 1994, processing a DNA sample took weeks and cost thousands of dollars. By the time Roth wrote this article, turnaround times had dropped to hours and costs to under a hundred dollars. Today, the technical barriers to universal DNA collection are essentially zero. The legal and ethical barriers are all that remain.

Genetic Privacy in the Age of Consumer Testing

The proliferation of consumer genetic testing services has created a parallel database ecosystem entirely outside law enforcement control. When investigators used GEDmatch to identify the Golden State Killer in 2018, they demonstrated that even individuals who never submitted their own DNA could be identified through relatives who had. This development, which Roth's article anticipated in its discussion of familial searching, has prompted renewed legislative attention to genetic privacy at both state and federal levels. The Genetic Information Nondiscrimination Act (GINA), passed in 2008, addresses genetic discrimination in employment and insurance but does not restrict law enforcement use of genetic databases.

Frequently Asked Questions

What is CODIS?

CODIS (Combined DNA Index System) is the FBI's national DNA database system. It contains DNA profiles from convicted offenders, arrestees, forensic evidence, and other sources. As of 2024, CODIS contains over 20 million offender profiles and has aided in hundreds of thousands of investigations.

What is familial DNA searching?

Familial DNA searching is a technique where a partial DNA match in a database is used to identify not the individual whose DNA is stored, but their biological relatives. This practice effectively places entire families under genetic surveillance when a single member's DNA is in the database.

Is DNA collection from arrestees constitutional?

The U.S. Supreme Court ruled in Maryland v. King (2013) that collecting DNA from individuals arrested for serious offenses is a reasonable search under the Fourth Amendment. However, the decision left open questions about the constitutionality of broader collection programs, familial searching, and long-term retention.