Fourth Amendment Commons^™

Reforming Institutions: The Judicial Function In Bankruptcy And Public Law Litigation, Kathleen G. Noonan, Jonathan C. Lipson, William H. Simon

Faculty Scholarship

Public law litigation (PLL) is among the most important and controversial types of dispute that courts face. These civil class actions seek to reform public agencies such as police departments, prison systems, and child welfare agencies that have failed to meet basic statutory or constitutional obligations. They are controversial because critics assume that judicial intervention is categorically undemocratic or beyond judicial expertise.

This Article reveals flaws in these criticisms by comparing the judicial function in PLL to that in corporate bankruptcy, where the value and legitimacy of judicial intervention are better understood and more accepted. Our comparison shows that judicial …

The End Of Intuition-Based High-Crime Areas, Ben Grunwald, Jeffrey A. Fagan

Faculty Scholarship

In 2000, the Supreme Court held in Illinois v. Wardlow that a suspect’s presence in a “high-crime area” is relevant in determining whether an officer has reasonable suspicion to conduct an investigative stop. Despite the importance of the decision, the Court provided no guidance about what that standard means, and over fifteen years later, we still have no idea how police officers understand and apply it in practice. This Article conducts the first empirical analysis of Wardlow by examining data on over two million investigative stops conducted by the New York Police Department from 2007 to 2012.

Our results suggest …

The End Of Intuition-Based High-Crime Areas, Ben Grunwald, Jeffrey Fagan

Faculty Scholarship

In 2000, the Supreme Court held in Illinois v. Wardlow that a suspect’s presence in a “high-crime area” is relevant in determining whether an officer has reasonable suspicion to conduct an investigative stop. Despite the importance of the decision, the Court provided no guidance about what that standard means, and over fifteen years later, we still have no idea how police officers understand and apply it in practice. This Article conducts the first empirical analysis of Wardlow by examining data on over two million investigative stops conducted by the New York Police Department from 2007 to 2012.

Our results suggest …

Immigration Detainers, Local Discretion, And State Law's Historical Constraints, Kate Evans

Faculty Scholarship

No abstract provided.

Byrd V United States: Unauthorized Drivers Of Rental Cars Have Fourth Amendment Rights? Not As Evident As It Seems, Tracey Maclin

Faculty Scholarship

No discerning student of the Supreme Court would contend that Justice Anthony Kennedy broadly interpreted the Fourth Amendment during his thirty years on the Court. His majority opinions in Maryland v. King, Drayton v. United States and his willingness to join the three key sections of Justice Scalia’s opinion in Hudson v. Maryland, which held that suppression is never a remedy for knock-and-announce violations, are just a few examples of Justice Kennedy’s narrow view of the Fourth Amendment.

In light of his previous votes in search and seizure cases, surprisingly Justice Kennedy, in what would be his final Fourth Amendment …

A Cognitive Theory Of The Third-Party Doctrine And Digital Papers, H. Brian Holland

Faculty Scholarship

For nearly 200 years, an individual’s personal papers enjoyed near-absolute protection from government search and seizure. That is no longer the case. With the widespread adoption of cloud-based information processing and storage services, the third-party doctrine operates to effectively strip our digital papers of meaningful Fourth Amendment protections.

This Article presents a new approach to reconciling current third-party doctrine with the technological realities of modern personal information processing. Our most sensitive data is now processed and stored on cloud computing systems owned and operated by third parties. Although we may consider these services to be private and generally secure, the …

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

Faculty Scholarship

No abstract provided.

Illegal Predicate Searches And Tainted Warrants After Heien And Strieff, Kit Kinports

Faculty Scholarship

A long-standing debate has surrounded the relationship between two features of the Fourth Amendment's exclusionary rule - the fruits of the poisonous tree doctrine and the good-faith exception - in cases where the evidence used to secure a search warrant was obtained in violation of the defendant's constitutional rights. Some judges and scholars maintain that the fruits of the poisonous tree doctrine takes precedence in such "tainted warrant" cases, leading to the suppression of any evidence seized in executing the warrant unless the warrant was supported by probable cause independent of the illegal predicate search. By contrast, others believe that …

Body Cameras And The Path To Redeem Privacy Law, Woodrow Hartzog

Faculty Scholarship

From a privacy perspective, the movement towards police body cameras seems ominous. The prospect of a surveillance device capturing massive amounts of data concerning people’s most vulnerable moments is daunting. These concerns are compounded by the fact that there is little consensus and few hard rules on how and for whom these systems should be built and used. But in many ways, this blank slate is a gift. Law and policy makers are not burdened by the weight of rules and technologies created in a different time for a different purpose. These surveillance and data technologies will be modern. Many …

Why Courts Fail To Protect Privacy: Race, Age, Bias, And Technology, Bernard Chao, Catherine Durso, Ian Farrell, Christopher Robertson

Faculty Scholarship

The Fourth Amendment protects against unreasonable “searches and seizures,” but in the digital age of stingray devices and IP tracking, what constitutes a search or seizure? The Supreme Court has held that the threshold question is supposed to depend on and reflect the “reasonable expectations” of ordinary members of the public concerning their own privacy. For example, the police now exploit the “third party” doctrine to access data held by email and cell phone providers, without securing a warrant, on the Supreme Court’s intuition that the public has no expectation of privacy in that information. Is that assumption correct? If …

Pricing The Fourth Amendment, Miriam Baer

Faculty Scholarship

No abstract provided.

Our Criminal Laws, Our Constitution, Sarah Seo

Faculty Scholarship

This essay reviews three recently published books that further explore this insight in the twentieth century. At first glance, vagrancy laws, the free will problem, and criminal records may seem to share little in common. But each study illuminates how criminal laws have defined our nation by creating what historian Barbara Welke has termed "borders of belonging," a boundary that laws create between people who enjoy full citizenship and those who do not. After all, a conviction and imprisonment are acts of social and political exclusion. Even the policing of suspected offenders often reveals who does not completely belong.

The …

The Supreme Court's Quiet Expansion Of Qualified Immunity, Kit Kinports

Faculty Scholarship

This Essay discusses the Supreme Court’s tendency in recent opinions to covertly expand the reach of the qualified immunity defense available to public officials in § 1983 civil rights suits. In particular, the Essay points out that the Court, often in per curiam rulings, has described qualified immunity in increasingly broad terms and has qualified and retreated from its precedents, without offering any explanation or even acknowledging that it is deviating from past practice.

In making this claim, I focus on three specific issues: the manner in which the Court characterizes the standard governing the qualified immunity defense; the question …

Heien'S Mistake Of Law, Kit Kinports

Faculty Scholarship

The Supreme Court has been whittling away at the Fourth Amendment for decades. The Court's 2014 ruling in Heien v. North Carolina allowing the police to make a traffic stop based on a reasonable mistake of law generated little controversy among the Justices and escaped largely unnoticed by the press-perhaps because yet another Supreme Court decision reading the Fourth Amendment narrowly is not especially noteworthy or because the opinion's cursory and overly simplistic analysis equating law enforcement's reasonable mistakes of fact and law minimized the significance of the Court's decision. But the temptation to dismiss Heien as just another small …

Gags As Guidance: Expanding Notice Of National Security Letter Investigations To Targets And The Public, Rebecca Wexler

Faculty Scholarship

National Security Letters (NSLs) are administrative subpoenas that the FBI uses to demand information from Internet service providers without prior judicial approval. They almost always include nondisclosure orders, commonly called “gags,” which prohibit the recipient from discussing the letter’s contents or even its mere existence. Courts and commentators have expressed concern that these gags may be overbroad prior restraints that violate the First Amendment and shroud government surveillance in undue secrecy. On November 30, 2015, an NSL gag order was lifted in full for the first time after a federal district judge found no “good reason” to retain it.

This …

Dna And Distrust, Kerry Abrams, Brandon L. Garrett

Faculty Scholarship

Over the past three decades, government regulation and funding of DNA testing has reshaped the use of genetic evidence across various fields, including criminal law, family law, and employment law. Courts have struggled with questions of when and whether to treat genetic evidence as implicating individual rights, policy trade-offs, or federalism problems. We identify two modes of genetic testing: identification testing, used to establish a person’s identity, and predictive testing, which seeks to predict outcomes for a person. Judges and lawmakers have often drawn a bright line at predictive testing, while allowing uninhibited identity testing. The U.S. Supreme Court in …

Anthony Amsterdam's Perspectives On The Fourth Amendment, And What It Teaches About The Good And Bad In Rodriguez V. United States, Tracey Maclin

Faculty Scholarship

Anthony Amsterdam’s article, Perspectives On The Fourth Amendment is one of the best, if not the best, law review article written on the Fourth Amendment. Thus, Minnesota Law Review on its hundredth anniversary fittingly recognizes and honors Professor Amsterdam’s article in its Symposium edition, “Standing on the Shoulders of Giants: Celebrating 100 Volumes of the Minnesota Law Review.” I am flattered that the Law Review invited me to participate in this Symposium.
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/="/">Specifically, my article connects two perspectives from Amsterdam’s article — the Fourth Amendment’s concern with discretionary police power and the Framers’ vision of the Fourth Amendment …

Regulation Or Resistance: A Counter-Narrative Of Constitutional Criminal Procedure, Alice Ristroph

Faculty Scholarship

No abstract provided.

Unsexing The Fourth Amendment, I. Bennett Capers

Faculty Scholarship

No abstract provided.

The Fourth Amendment And Surveillance In A Digital World, Arthur Leavens

Faculty Scholarship

Technology has transformed government surveillance and opened traditionally private information to official scrutiny. The current privacy-based approach to the Fourth Amendment is unable to cope with the changes. This Article offers a solution to the problems that technological surveillance techniques present. Starting with the introduction of the approach in Katz, the Article reviews the development of privacy-based approach. It then looks at three 21st century Supreme Court cases that grappled with applying the Katz test to advanced technological surveillance techniques: Kyllo, Quon, and Jones. These cases demonstrate the problems that the privacy-based approach creates and the …

Following The Script: Narratives Of Suspicion In Terry Stops In Street Policing, Jeffery Fagan, Amanda Geller

Faculty Scholarship

Regulation of Terry stops of pedestrians by police requires articulation of the reasonable and individualized bases of suspicion that motivate their actions. Nearly five decades after Terry, courts have found it difficult to articulate the boundaries or parameters of reasonable suspicion. The behavior and appearances of individuals combine with the social and spatial contexts in which police observe them to create an algebra of suspicion. Police can proceed to approach and temporarily detain a person at a threshold of suspicion that courts have been unable and perhaps unwilling to articulate. The result has been sharp tensions within Fourth Amendment …

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 …

Secrecy, Intimacy, And Workable Rules: Justice Sotomayor Stakes Out The Middle Ground In United States V. Jones, Miriam H. Baer

Faculty Scholarship

No abstract provided.

When Enough Is Enough: Location Tracking, Mosaic Theory, And Machine Learning, Steven M. Bellovin, Renée M. Hutchins, Tony Jebara, Sebastian Zimmeck

Faculty Scholarship

Since 1967, when it decided Katz v. United States, the Supreme Court has tied the right to be free of unwanted government scrutiny to the concept of reasonable xpectations of privacy.^[1] An evaluation of reasonable expectations depends, among other factors, upon an assessment of the intrusiveness of government action. When making such assessment historically the Court has considered police conduct with clear temporal, geographic, or substantive limits. However, in an era where new technologies permit the storage and compilation of vast amounts of personal data, things are becoming more complicated. A school of thought known as “mosaic theory” …

Failing Expectations: Fourth Amendment Doctrine In The Era Of Total Surveillance, Olivier Sylvain

Faculty Scholarship

Today’s reasonable expectation test and the third-party doctrine have little to nothing to offer by way of privacy protection if users today are at least conflicted about whether transactional noncontent data should be shared with third parties, including law enforcement officials. This uncertainty about how to define public expectation as a descriptive matter has compelled courts to defer to legislatures to find out what public expectation ought to be more as a matter of prudence than doctrine. Courts and others presume that legislatures are far better than courts at defining public expectations about emergent technologies.This Essay argues that the reasonable …

Privacy In Public, Joel R. Reidenberg

Faculty Scholarship

As government and private companies rapidly expand the infrastructure of surveillance from cameras on every street corner to facial recognition for photographs on social media sites, privacy doctrines built on seclusion are at odds with technological advances. This essay addresses a key conceptual problem in US privacy law identified by Justice Sotomayor in U.S. v. Jones and by Justice Scalia in Kyllo v. U.S.; namely that technological capabilities undermine the meaning of the third-party doctrine and the 4th Amendment's ‘reasonable expectation of privacy’ standard. The essay argues that the conceptual problem derives from the evolution of three stages of development …

Probable Cause And Reasonable Suspicion: Totality Tests Or Rigid Rules?, Kit Kinports

Faculty Scholarship

This piece argues that the Supreme Court's April 2014 decision in Navarette v. Calfornia, like last Term's opinion in Florida v. Harris, deviates from longstanding Supreme Court precedent treating probable cause and reasonable suspicion as totality-of-the-circumstances tests. Instead, these two recent rulings essentially rely on rigid rules to define probable cause and reasonable suspicion. The article criticizes the Court for selectively endorsing bright-line tests that favor the prosecution, and argues that both decisions generate rules that oversimplify and therefore tend to be overinclusive.

The Right To Quantitative Privacy, David Gray, Danielle K. Citron

Faculty Scholarship

We are at the cusp of a historic shift in our conceptions of the Fourth Amendment driven by dramatic advances in surveillance technology. Governments and their private sector agents continue to invest billions of dollars in massive data-mining projects, advanced analytics, fusion centers, and aerial drones, all without serious consideration of the constitutional issues that these technologies raise. In United States v. Jones, the Supreme Court signaled an end to its silent acquiescence in this expanding surveillance state. In that case, five justices signed concurring opinions defending a revolutionary proposition: that citizens have Fourth Amendment interests in substantial quantities of …

A Shattered Looking Glass: The Pitfalls And Potential Of The Mosaic Theory Of Fourth Amendment Privacy, David Gray, Danielle K. Citron

Faculty Scholarship

On January 23, 2012, the Supreme Court issued a landmark non-decision in United States v. Jones. In that case, officers used a GPS-enabled device to track a suspect’s public movements for four weeks, amassing a considerable amount of data in the process. Although ultimately resolved on narrow grounds, five Justices joined concurring opinions in Jones expressing sympathy for some version of the “mosaic theory” of Fourth Amendment privacy. This theory holds that we maintain reasonable expectations of privacy in certain quantities of information even if we do not have such expectations in the constituent parts. This Article examines and explores …