Right Discovery Staff Writer
That question quickly becomes more complicated when "everything" can mean someone's entire phone, years of location data, a massive DNA database, or millions of digital records. In the latest episode of Brief Encounters, Kevin M. Clark and retired U.S. Magistrate Judge John Facciola discuss how the Fourth Amendment's long-standing principles of privacy and particularity are being tested by today's technology.
Kevin and Judge Facciola’s conversation gets into some fascinating territory, including reverse-location searches, digital warrants, online consent, and the government's growing access to large datasets, before moving into issues that are increasingly familiar to litigators and e-discovery professionals. How should privacy factor into civil discovery? When is a full-device search justified? And what changes when AI can search and analyze enormous collections with a simple prompt?
These are just a few of the questions raised in the conversation. Here are some highlights to get you started before you listen to the full episode.
For Judge Facciola, concerns about digital searches began well before smartphones became an essential part of daily life.
During his time on the bench, he encountered search warrant applications that essentially asked investigators to open every file on a computer because the relevant evidence could be hidden anywhere. A file labeled "pictures from Yellowstone," for example, might contain something entirely unrelated to its name.
That approach raised an important question for Judge Facciola. If the Fourth Amendment requires a warrant to particularly describe what investigators are looking for, can a warrant that effectively says "look through everything until you find it" really satisfy that requirement?
His answer was deeply influenced by the development of information science and technology-assisted searching. As search technology became more sophisticated, investigators gained the ability to conduct narrower searches and use statistically validated methods to determine whether those searches were likely to locate the relevant information.
In other words, technology did not necessarily require broader searches. It could make more precise searches possible. That distinction became an important part of Judge Facciola's thinking about particularity.
The conversation then turns to one of the most significant questions surrounding digital privacy today: reverse searches.
A traditional investigation generally begins with a person who is suspected of wrongdoing and then seeks information connected to that individual. A reverse search approaches the problem from the other direction. Investigators begin with a piece of information, such as a location, DNA profile, or image, and search a much larger population to identify the person associated with it.
Judge Facciola believes that approach raises serious Fourth Amendment concerns because the government may have to collect or examine information belonging to many people who have no connection to the investigation before identifying the person it is actually looking for.
The historical comparison is difficult to ignore. The Fourth Amendment's particularity requirement developed in response to general warrants, which permitted authorities to conduct broad searches in the hope of finding evidence of wrongdoing. Today, the technology is dramatically different, but Judge Facciola questions whether the underlying principle has really changed.
He also points out that the courts may not necessarily resolve that constitutional question in every case. Other issues, including the good-faith exception, could allow a court to decide a case without determining whether a particular reverse search constitutes a general warrant. That uncertainty makes the issue especially important for lawyers watching the development of these cases.
Another part of the discussion addresses an issue almost everyone encounters but few people think about carefully: online terms of service. When someone clicks "I agree," have they actually consented to the collection and use of their information in a way that eliminates their expectation of privacy?
Judge Facciola questions whether traditional concepts of consent translate easily to modern digital agreements. Terms of service can be lengthy, difficult to understand, and presented in ways that make it unlikely that an ordinary user has actually read or understood the provisions affecting privacy.
The issue becomes even more complicated when the government relies on the third-party doctrine, which has traditionally limited privacy protections for information voluntarily shared with another party.
Modern technology challenges that concept because so much of daily life depends on sharing information with service providers. Location data, communications, searches, purchases, photographs, and other personal information routinely pass through third-party systems simply because that is how digital services work.
The courts have already placed limits on applying the third-party doctrine to certain forms of technology-mediated information. Where those limits ultimately lead remains an important question.
One of the most compelling aspects of the conversation is how quickly the Fourth Amendment discussion moves into civil litigation and discovery. Consider a typical BYOD situation. An employee uses one smartphone for work and personal life. The same device may contain business emails alongside family text messages, photographs, location information, medical appointments, and a child's soccer schedule.
When litigation begins, a request for the entire device may seem straightforward. But should relevance alone justify access to everything stored on it? Judge Facciola suggests that courts should demand more before permitting a full forensic examination. If there is evidence that information may have been intentionally destroyed, a broader forensic search may be justified. Without that kind of showing, narrower methods may provide a better balance between legitimate discovery needs and personal privacy.
That distinction matters because the cost of collecting, processing, reviewing, and protecting information from an entire device can be substantial. More importantly, a full-device search can expose information that has nothing to do with the dispute.
The problem is also becoming larger as more devices and systems generate information. Smartphones are only one source. Wearables, home security cameras, smart devices, and automatically recorded Teams and Zoom meetings are all becoming potential sources of electronically stored information. As the volume of available information grows, so does the importance of deciding what should actually be searched.
That raises a broader issue for civil discovery. Federal discovery rules already require courts and parties to consider relevance, burden, and proportionality. But privacy is increasingly intertwined with each of those considerations.
A request can be relevant without necessarily being appropriate in its broadest form. A database may contain information that could potentially help a litigant while also containing sensitive information about people who have no connection to the case. Judge Facciola suggests that privacy should have a meaningful role in those decisions, even if the rules do not always spell it out explicitly.
For litigators, that could have practical consequences during meet-and-confers and when drafting discovery protocols. Rather than waiting until a dispute reaches the court, counsel may need to address privacy limitations and targeted search methods from the beginning. The central question becomes not simply whether relevant information exists, but whether there is a reasonable and appropriately limited way to obtain it.
Toward the end of the conversation, Kevin and Judge Facciola turn to artificial intelligence and the growing use of AI-assisted searching. Technology-assisted review has already changed how lawyers approach large document collections. The next generation of tools allows lawyers to create prompts that can guide searches and analysis across enormous datasets.
That development creates a new set of legal questions. Are lawyer-created prompts protected as attorney work product? How should lawyers validate AI-assisted searches? What level of testing is necessary to demonstrate that the process produced reliable results?
And perhaps most importantly, how should lawyers respond when AI produces an answer that sounds convincing but is simply wrong? Judge Facciola's advice is straightforward: lawyers must verify their work.
That principle may sound familiar, but its importance increases as AI becomes more deeply integrated into legal practice. Courts are already encountering fabricated citations and other AI-related errors, while questions surrounding authenticity and deepfakes are receiving greater attention.
The technology may be new, but the professional obligation to understand the tools being used and verify the work produced by those tools is not.
The conversation between Kevin M. Clark and Judge Facciola ultimately connects several issues that might initially appear unrelated. A location database, a DNA repository, a facial-recognition system, an employee's smartphone, a cloud account, and an AI-assisted document search all present variations of the same fundamental problem. Modern technology makes it possible to collect and search enormous quantities of information with extraordinary speed. The law, however, still has to determine where the boundaries should be.
That tension is particularly important because digital information rarely belongs neatly to one person or one case. A single device can contain information about an entire family. A location database can contain information about thousands of people. A corporate system can contain communications involving employees, customers, and third parties. The more information that becomes searchable, the more important it becomes to decide where a search should stop.
That is what makes this conversation with Judge Facciola so timely. It is not simply a discussion about Fourth Amendment doctrine. It is a discussion about how traditional legal principles should function when technology gives investigators, litigants, and lawyers capabilities that would have been unimaginable when those principles were first established. And the conversation raises questions that courts, litigators, and e-discovery professionals will be dealing with for years.
There is much more to the discussion than can be captured here, including Judge Facciola's firsthand experiences with digital warrants, his views on reverse-location searches, the third-party doctrine, privacy in civil discovery, BYOD devices, and the role of AI in legal search.
For anyone working with electronically stored information, digital privacy, litigation, or emerging legal technology, the full conversation offers an opportunity to hear these issues discussed by someone who confronted many of them from the bench.
Listen to the full episode of Brief Encounters, brought to you by the DC Bar Litigation Community, to hear Kevin Clark and Judge John Facciola discuss where the Fourth Amendment meets the realities of modern digital evidence.
Judge John M. Facciola is a retired U.S. Magistrate Judge for the U.S. District Court for the District of Columbia, where he served from 1997 to 2015. Widely recognized for his work in electronic discovery and digital privacy, he authored more than 700 opinions during his time on the bench. He now an adjunct professor at Georgetown Law and is a frequent lecturer on e-discovery, technology, and modern litigation. Judge Facciola is also a recipient of The Sedona Conference’s Lifetime Achievement Award.
Kevin M. Clark serves as the CEO of Right Discovery, where he leads the company’s strategic vision, growth, and innovation across legal services, technology, and eDiscovery. A licensed attorney in Texas, the District of Columbia, and Illinois, Kevin brings extensive experience across law firms and legal service providers. He serves as Co-Chair of the DC Bar Association’s Litigation Community Steering Committee, where he helps advance industry dialogue and best practices in eDiscovery, digital privacy, litigation technology, and the responsible adoption of AI. Committed to advancing the legal profession, Kevin also volunteers his legal expertise to assist veterans with legal matters and serves on the Advisory Board of Life Preservers, Inc.
The D.C. Bar Litigation Community brings legal professionals together for continuing education, professional development, and networking. The Community supports programming on trial skills, advocacy, and other litigation topics, while giving members opportunities to contribute to educational programs and publications. Members can also connect with judges and judicial officers through events such as the annual judicial reception and engage with proposed court rules and legislation relevant to the practice of law.
Right Discovery, headquartered in Dallas, Texas, partners with law firms and corporate legal teams locally and abroad, to navigate complex litigation, investigations, and eDiscovery challenges with practical expertise and tailored solutions. By combining experienced professionals, proven methodologies, and innovative technology, we help clients manage data, control costs, and make informed decisions throughout the discovery process. As the legal industry evolves, we continue to advance our approach to eDiscovery, including the thoughtful adoption of AI and emerging technologies. Learn more about how Right Discovery brings strategy, technology, and experience together to meet the demands of modern litigation.
Topics: Fourth Amendment, digital privacy, Judge John Facciola, Kevin M Clark, eDiscovery, electronic discovery, digital warrants, reverse warrants, civil discovery, artificial intelligence