Law Commons^™

Circumventing The Fourth Amendment: The Unconstitutional Nature Of Geofence Warrants, Shelby Stender

Utah Law Review

Federal and state law enforcement agencies are using a new tactic for gathering evidence: geofence warrants. These warrants allow law enforcement to gather historical location data collected by third party companies including Google, Facebook, Amazon, and Apple. Armed with a geofence warrant today, law enforcement agencies can track the previous location of an individual at any point from the moment they acquired a cell phone—so long as the location history is turned on. The tactic has grown in popularity since 2019 and has been used to uncover suspects in cases where police had few leads. Troublingly though, the tactic has …

A New Test For The New Crime Exception, Colin Miller

Utah Law Review

The new crime exception to the Fourth Amendment exclusionary rule allows prosecutors to introduce evidence connected to new crimes committed by defendants who were illegally detained and/or questioned. Unfortunately, as illustrated in this Article, courts largely have applied this new crime exception without any analytical framework or regard for the severity of the initial police misconduct or the defendant’s response. Moreover, courts have begun applying the new crime exception to crimes such as giving a fake name in response to an un-Mirandized interrogation following a lawful arrest.

By doing so, courts have allowed the new crime exception to swallow two …

The Carpenter Test As A Transformation Of Fourth Amendment Law, Matthew Tokson

Utah Law Faculty Scholarship

For over fifty years, the Fourth Amendment’s scope has been largely dictated by the Katz test, which applies the Amendment’s protections only when the government has violated a person’s “reasonable expectation of privacy.” This vague standard is one of the most criticized doctrines in all of American law, and its lack of coherence has made Fourth Amendment search law notoriously confusing. Things have become even more complex following the Supreme Court’s landmark decision in Carpenter v. United States, which has spawned its own alternative test for determining the Fourth Amendment’s scope. The emerging Carpenter test looks to the revealing nature …

Telephone Pole Cameras Under Fourth Amendment Law, Matthew Tokson

Utah Law Faculty Scholarship

In a series of recent cases, police officers have mounted sophisticated surveillance cameras on telephone poles and pointed them at the homes of people suspected of a crime. These cameras often operate for months or even years without judicial oversight, collecting vast quantities of video footage on suspects and their activities near the home. Pole camera surveillance raises important Fourth Amendment questions that have divided courts and puzzled scholars.

These questions are complicated because Fourth Amendment law is complicated. This is especially the case today as Fourth Amendment law is in a transitional phase, caught between older and newer paradigms …

Smart Meters As A Catalyst For Privacy Law, Matthew Tokson

Utah Law Faculty Scholarship

Smart utility meters raise several puzzling legal questions—and answering them can help point the way toward the future of Fourth Amendment and civil privacy law. This forum essay addresses two such issues: use restrictions on collected data, and voluntary data disclosure.

First, more than any other current technology, smart meters compel the development of use restrictions on collected data. The benefits of smart meters are potentially enormous, such that categorically prohibiting public utilities from collecting smart meter data is likely beyond the pale. Yet allowing law enforcement agents to obtain detailed or intimate data about the home without a warrant …

The Aftermath Of Carpenter: An Empirical Study Of Fourth Amendment Law, 2018-2021, Matthew Tokson

Utah Law Faculty Scholarship

Fourth Amendment law is in flux. The Supreme Court recently established, in the landmark case Carpenter v. United States, that individuals can retain Fourth Amendment rights in information they disclose to a third party. In the internet era, this ruling has the potential to extend privacy protections to a huge variety of sensitive digital information. But Carpenter is also notoriously vague. Scholars and lower courts have tried to guess at what the law of Fourth Amendment searches will be going forward—and have reached different, contradictory conclusions.

This Article reports the results of a large-scale empirical study of the impact of …

Social Norms In Fourth Amendment Law, Matthew Tokson, Ari Ezra Waldman

Utah Law Faculty Scholarship

Courts often look to existing social norms to resolve difficult questions in Fourth Amendment law. In theory, these norms can provide an objective basis for courts’ constitutional decisions, grounding Fourth Amendment law in familiar societal attitudes and beliefs. In reality, however, social norms can shift rapidly, are constantly being contested, and frequently reflect outmoded and discriminatory concepts. This Article draws on contemporary sociological literatures on norms and technology to reveal how courts’ reliance on norms leads to several identifiable errors in Fourth Amendment jurisprudence.

Courts assessing social norms generally adopt what we call the closure principle, or the idea that …

42nd Annual Foulston-Siefkin Lecture: The Next Wave Of Fourth Amendment Challenges After Carpenter, Matthew Tokson

Utah Law Faculty Scholarship

This is an edited and adapted version of the 42nd Annual Foulston Siefkin Lecture, delivered at Washburn University School of Law.

The lecture discusses the future of Fourth Amendment law following the Supreme Court’s enormously important decision in Carpenter v. United States. It analyzes Carpenter and argues that its detailed account of the privacy harms caused by government surveillance will be its most important legacy. Moreover, the Court’s emphasis on the risk of privacy harm is not a one-off or a sharp break from previous practice. Carpenter is consistent with a long line of Supreme Court decisions ignoring or reshaping …

What Caused The 2016 Chicago Homicide Spike? An Empirical Examination Of The 'Aclu Effect' And The Role Of Stop And Frisks In Preventing Gun Violence, Paul Cassell, Richard Fowles

Utah Law Faculty Scholarship

Homicides increased dramatically in Chicago in 2016. In 2015, 480 Chicago residents were killed. The next year, 754 were killed–274 more homicide victims, tragically producing an extraordinary 58% increase in a single year. This article attempts to unravel what happened.

This article provides empirical evidence that the reduction in stop and frisks by the Chicago Police Department beginning around December 2015 was responsible for the homicide spike that started immediately thereafter. The sharp decline in the number of stop and frisks is a strong candidate for the causal factor, particularly since the timing of the homicide spike so perfectly coincides …

Environmental Privacy, Katrina F. Kuh

Utah Law Review

The purpose of this Article is not to anticipate whether or how the Fourth Amendment might apply to specific efforts to collect information about environmentally significant individual behaviors. The purpose is to discern the considerations that have proven salient in balancing environmental regulation and privacy to date that may likewise be relevant to navigating privacy concerns that arise with respect to policy directed to environmentally significant individual behaviors.

In this regard, the Article’s survey suggests that neither the fact that environmentally significant individual behaviors must be aggregated to produce environmental harm nor the fact that individuals, as opposed to commercial …