Fourth Amendment Commons^™

Privacy In The Age Of Platforms: How Digital Advancements Are Outrunning Our Constitution, Haleigh Fagundes

Capstone Projects and Master's Theses

This project analyzes the procedural history of Fourth Amendment doctrine in the Supreme Court. This timeline begins with the 1928 case of Olmstead v. United States and proceeds with recent cases that resolve more modern concerns such as location tracking via cell-cite information, as seen in Carpenter v. United States (2018). Prevalent cases are analyzed through both majority and dissenting opinions to demonstrate the entire Courts’ attitude towards the interpretation. Though more recently the Court has moved towards expanding the expectation of privacy that one can assume from the Fourth Amendment, digital privacy has yet to be incorporated. The research …

Trespass To Chattel And The Fourth Amendment, Will Baskin

Texas A&M Journal of Property Law

Like an adolescent maturing into adulthood, Fourth Amendment search doctrine has gone through phases. Scholars may debate the underlying principles that have governed each phase, but they agree that two Supreme Court decisions dominate the doctrine as it stands today: Katz v. United States and United States v. Jones. The younger of these two rivals, Jones, has caused its share of consternation. Courts have struggled to consistently apply its trespass-based test, despite the test’s seemingly simple formulation. This Note considers the Jones test in the context of personal property, or chattel, making two arguments: first, careful adherence to common-law principles …

Facial Recognition Technology And The First Amendment, Joseph A. Tomain

Articles by Maurer Faculty

The growing ubiquity of facial recognition technology (FRT) is a problem. While much has been written on harmful government use of FRT, little has been written regarding harmful private actor use. This Article helps fill a gap in the literature by providing a detailed analysis of the First Amendment interests at stake when private actors use FRT. Specifically, this Article analyzes whether laws that limit the use of publicly available photographs to create faceprints for inclusion in FRT databases violate the First Amendment rights of private actors.

In May 2025, a multidistrict litigation against Clearview AI, an FRT company, offered …

Free Movement Rights And The American City, Ryan Stoa

FIU Law Review

American cities are facing an inflection point. Widespread dissatisfaction with urban planning outcomes is making land use and transportation policies (such as congestion pricing) a mainstream topic of debate. Suburban sprawl and housing shortages are moving urban populations into the periphery, commuting times (and associated mental health problems) are increasing, and pedestrian and cyclist deaths caused by vehicles are at all-time highs. American cities that were largely planned and built in the twentieth century based on assumptions that we now know are flawed are not meeting the needs of their residents, and urban planners are making changes to reshape urban …

Bond Conditions As Fourth Amendment Seizures, Rebecca Laden

Cardozo Law Review

No abstract provided.

Far-Fetched Uses Of Drug Detection Dog Alerts: A Case Note On United States V. Braddy, Daniel Kaseff

Cardozo Law Review

No abstract provided.

Escaping Circularity: The Fourth Amendment And Property Law, João Marinotti

Articles by Maurer Faculty

The Supreme Court’s “reasonable expectation of privacy” test under the Fourth Amendment has often been criticized as circular, and hence subjective and unpredictable. The Court is presumed to base its decisions on society’s expectations of privacy, while society’s expectations of privacy are themselves presumed to be based on the Court’s judgements. As a solution to this problem, property law has been repeatedly propounded as an allegedly independent, autonomous area of law from which the Supreme Court can glean reasonable expectations of privacy without falling back into tautological reasoning.

Such an approach presupposes that property law is not itself circular. If …

Making The Impractical, Practical: A Modest And Overdue Approach To Reforming Fourth Amendment Consent Search Doctrine, Augustine P. Manga

William & Mary Journal of Race, Gender, and Social Justice

At some point in your life, you may have a personal encounter with a police officer. During that moment, you may feel utterly powerless, especially if you do not know your rights. One important right that police are not required to inform people of is their right to deny an officer’s request to search their property. Forty-eight years ago, the Supreme Court made its position clear in Schneckloth v. Bustamonte that requiring law enforcement to provide citizens with this warning would be “thoroughly impractical.” Since then, the relationship between law enforcement and society—especially communities of color—has gradually deteriorated, and states …

"Hey, Hey! Ho, Ho! These Mass Arrests Have Got To Go!": The Expressive Fourth Amendment Argument, Karen J. Pita Loor

William & Mary Journal of Race, Gender, and Social Justice

The racial justice protests ignited by the murder of George Floyd in May 2020 constitute the largest protest movement in the United States. Estimates suggest that between fifteen and twenty-six million people protested across the country during the summer of 2020 alone. Not only were the number of protestors staggering, but so were the number of arrests. Within one week of when the video of George Floyd’s murder went viral, police arrested ten thousand people demanding justice on American streets, with police often arresting activists en masse. This Essay explores mass arrests and how they square with Fourth Amendment …

Restoring Causality In Attenuation: Establishing The Breadth Of A Fourth Amendment Violation, Bryan H. Ward

West Virginia Law Review

When the police violate a suspect’s Fourth Amendment rights, what often follows is the discovery of incriminating evidence. Sometimes the evidence is discovered directly after the Fourth Amendment violation. In other situations, the evidence comes by a more indirect route and may occur long after the original Fourth Amendment violation. Courts struggle when trying to decide if the discovery of this indirectly obtained evidence was caused by the police misconduct. This causal question is important because causality acts as a limiting principle when deciding when to apply the exclusionary rule. A basic view of the exclusionary rule suggests that evidence …

The Expressive Fourth Amendment, Karen Pita Loor

Faculty Scholarship

After the eight-minute and forty-six second video of George Floyd’s murder went viral, cities across the United States erupted in mass protests with people outraged by the death of yet another Black person at the hands of police. The streets were flooded for months with activists and community members of all races marching, screaming, and demonstrating against police brutality and for racial justice. Police—like warriors against enemy forces—confronted overwhelmingly peaceful protesters with militarized violence and force. Ultimately, racial justice protesters and members of the media brought lawsuits under section 1983 of the Civil Rights Act in the district courts of …

Fitbit Data And The Fourth Amendment: Why The Collection Of Data From A Fitbit Constitutes A Search And Should Require A Warrant In Light Of Carpenter V. United States, Alxis Rodis

William & Mary Bill of Rights Journal

No abstract provided.

Divided Court Issues Bright-Line Ruling On Fourth Amendment Seizures, Jeffrey Bellin

Popular Media

No abstract provided.

Brief Of Amici Curiae Professors Katherine Mims Crocker And Brandon Hasbrouck In Support Of Neither Party With Respect To Defendant's Motion To Dismiss, Katherine Mims Crocker, Brandon Hasbrouk

Briefs

No abstract provided.

Justice Sonia Sotomayor: The Court’S Premier Defender Of The Fourth Amendment, David L. Hudson Jr.

Seattle University Law Review

This essay posits that Justice Sotomayor is the Court’s chief defender of the Fourth Amendment and the cherished values it protects. She has consistently defended Fourth Amendment freedoms—in majority, concurring, and especially in dissenting opinions. Part I recounts a few of her majority opinions in Fourth Amendment cases. Part II examines her concurring opinion in United States v. Jones. Part III examines several of her dissenting opinions in Fourth Amendment cases. A review of these opinions demonstrates what should be clear to any observer of the Supreme Court: Justice Sotomayor consistently defends Fourth Amendment principles and values.

Case Preview: When Is A Fleeing Suspect “Seized”?, Jeffrey Bellin

Popular Media

The Fourth Amendment prohibits unreasonable “searches” and “seizures.” On Wednesday, the Supreme Court is scheduled to hear oral argument in Torres v. Madrid, a case that will provide important guidance on what constitutes a Fourth Amendment seizure. Here’s a rundown of the case starting with the relevant facts and procedural history, followed by a discussion of the legal issues and finally a couple of things to watch for at the argument.

Uncertain Immunity: Assessing Qualified Immunity In The Context Of Post-Arrest Excessive-Force Claims Arising Prior To A Judicial Determination Of Probable Cause, J. Tyler Barton

West Virginia Law Review

No abstract provided.

Drones: Where Does The National Airspace System Start?, Jason T. Lorenzon J.D.

National Training Aircraft Symposium (NTAS)

Unmanned Aerial Systems (UAS), Unmanned Aeronautical Vehicles (UAV), drones and Personal Aerial Vehicles (PAV) constitute the greatest technological advancement since the jet age. (Elaine Chao, Secretary of Transportation, October 26, 2017) This technological advancement has prompted significant public policy challenges and the need for new laws regarding navigable airspace. This proposal investigates how airspace used by drones will evolve given existing Constitutional and common law principals. These principals will influence the creation, development and modification of UAS airspace regulations by the Federal Aviation Administration (FAA).

Two critical but unanswered questions concerning the National Airspace System, are where does navigable airspace …

Lawful Searches Incident To Unlawful Arrests: A Reform Proposal, Mark A. Summers

Faculty Scholarship

No abstract provided.

Custodial Compulsion, Kyron J. Huigens

Articles

In cases that fall under Miranda v Arizona, police interrogators not only give a suspect reasons to confess; they also suggest that the suspect ought to confess. In doing so, interrogators effectively invoke the Wigmorean duty of a citizen to produce any evidence he has in his possession, including his own confession. That is, they invoke the duty against which the Self Incrimination Clause stands, so that the clause is applicable to police interrogations, and is violated where it is not waived. This means that “a Miranda violation” is a violation of the Self Incrimination Clause in the field, just …

Harmless Constitutional Error: How A Minor Doctrine Meant To Improve Judicial Efficiency Is Eroding America's Founding Ideals, Ross C. Reggio

CMC Senior Theses

The United States Constitution had been in existence for almost two hundred years before the Supreme Court decided that some violations of constitutional rights may be too insignificant to warrant remedial action. Known as "harmless error," this statutory doctrine allows a court to affirm a conviction when a mere technicality or minor defect did not affect the defendant's substantial rights. The doctrine aims to promote judicial efficiency and judgment finality. The Court first applied harmless error to constitutional violations by shifting the statutory test away from the error's effect on substantial rights to its impact on the jury's verdict. Over …

Police Ignorance And Mistake Of Law Under The Fourth Amendment, Eang L. Ngov

Faculty Scholarship

No abstract provided.

The Outer Limits: Imsi-Catchers, Technology, And The Future Of The Fourth Amendment, Ryan C. Chapman

Pepperdine Law Review

Recent advances in technology are posing new challenges for a legal system based on decades-old precedent. Nowhere is this more apparent than in law enforcement’s warrantless use of IMSI Catchers. These devices mimic a cell phone tower, and when the device is activated, cell phones will naturally connect to them. Law enforcement officers can use those intercepted cell phone signals to track a suspect’s movements in real time with startling accuracy. Scholarly commentary on these devices has largely concluded that their use requires a warrant. This Comment engages in a close examination of Fourth Amendment precedent and argues that, as …

When The Police Get The Law Wrong: How Heien V. North Carolina Further Erodes The Fourth Amendment, Vivan M. Rivera

Loyola of Los Angeles Law Review

No abstract provided.

Criminal Innovation And The Warrant Requirement: Reconsidering The Rights-Police Efficiency Trade-Off, Tonja Jacobi, Jonah Kind

William & Mary Law Review

It is routinely assumed that there is a trade-off between police efficiency and the warrant requirement. But existing analysis ignores the interaction between law-enforcement investigative practices and criminal innovation. Narrowing the definition of a search or otherwise limiting the requirement for a warrant gives criminals greater incentive to innovate to avoid detection. With limited resources to develop countermeasures, law enforcement officers will often be just as effective at capturing criminals when facing higher Fourth Amendment hurdles. We provide a game-theoretic model that shows that when law-enforcement investigation and criminal innovation are considered in a dynamic context, the police efficiency rationale …

Online Data Breaches, Standing, And The Third-Party Doctrine, Adam Lamparello

Cardozo Law Review de•novo

This Essay argues that, in the context of online data breaches, these doctrines hinder consumers from receiving full monetary compensation and do not adequately safeguard privacy rights. For example, courts frequently dismiss consumers’ suits against online service providers for lack of standing, which results in consumers bearing the cost for damages that the providers were in a position to prevent. This Essay argues that the Supreme Court should relax the standing doctrine’s “imminent harm” requirement and permit consumers to sue providers for mitigation damages. In addition, the Court should abandon the longstanding principle that citizens lose all privacy protections in …

Government Analysis Of Shed Dna Is A Search Under The Fourth Amendment, Tracey Maclin

UF Law Faculty Publications

This article addresses whether the Fourth Amendment is implicated when police surreptitiously collect and analyze a person’s involuntarily shed DNA. Law enforcement officers will often obtain shed or abandoned DNA samples from persons who they suspect have committed crimes, but lack sufficient evidence to arrest or detain such persons. When utilizing abandoned or shed DNA for criminal investigative purposes, there are two state actions which arguably trigger Fourth Amendment protection. First, the collection of the biological material which contains a person’s DNA might be considered a search under the amendment. Courts, however, have uniformly rejected this argument. For example, when …

Resisting Wholesale Electronic Invasion Of The Fourth Amendment, Michael E. Tigar

Faculty Scholarship

No abstract provided.

Government Analysis Of Shed Dna Is A Search Under The Fourth Amendment, Tracey Maclin

Faculty Scholarship

This article addresses whether the Fourth Amendment is implicated when police surreptitiously collect and analyze a person’s involuntarily shed DNA.

Law enforcement officers will often obtain shed or abandoned DNA samples from persons who they suspect have committed crimes, but lack sufficient evidence to arrest or detain such persons. When utilizing abandoned or shed DNA for criminal investigative purposes, there are two state actions which arguably trigger Fourth Amendment protection. First, the collection of the biological material which contains a person’s DNA might be considered a search under the amendment. Courts, however, have uniformly rejected this argument. For example, when …

The Conversational Consent Search: How “Quick Look” And Other Similar Searches Have Eroded Our Constitutional Rights, Alexander A. Mikhalevsky

Georgia State University Law Review

One area in which law enforcement agencies have stretched constitutional limits concerns the scope of a suspect’s consent to search his or her vehicle. Police forces across the country have tested the limits of consent by asking vague, conversational questions to suspects with the goal of obtaining a suspect’s consent to search, even though that individual may not want to allow the search or may not know that he or she has the right to deny consent.

Conversational phrases like “Can I take a quick look?” or “Can I take a quick look around?” have “emerg[ed] as . . . …