Law Commons^™

Are Police Officers Bayesians? Police Updating In Investigative Stops, Jeffrey A. Fagan, Lila J.E. Nojima

Faculty Scholarship

Theories of rational behavior assume that actors make decisions where the benefits of their acts exceed their costs or losses. If those expected costs and benefits change over time, behavior will change accordingly as actors learn and internalize the parameters of success and failure. In the context of proactive policing, police stops that achieve any of several goals — constitutional compliance, stops that lead to “good” arrests or summonses, stops that lead to seizures of weapons, drugs, or other contraband, or stops that produce good will and citizen cooperation — should signal to officers the features of a stop that …

Cops And Cars: How The Automobile Drove Fourth Amendment Law, Tracey Maclin

Faculty Scholarship

This is an essay on Professor Sarah A. Seo’s new book, Policing the Open Road: How Cars Transformed American Freedom (Harvard Univ. Press 2019). I focus on Professor Seo’s analysis of Carroll v. United States, 267 U.S. 132 (1925) and Brinegar v. United States, 338 U.S. 160 (1949). Carroll is important not only because it was the Court’s first car case. Understanding Carroll (and Brinegar, which solidified and expanded Carroll’s holding) is essential because, nearly one hundred years later, its logic continues to direct how the modern Court resolves Fourth Amendment claims of motorists. Put simply, a majority of today’s …

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.

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 to bar …

Maryland V. King: Terry V. Ohio Redux, Tracey Maclin

Faculty Scholarship

In Maryland v. King, the Supreme Court addressed whether forensic testing of DNA samples taken from persons arrested for violent felonies violated the Fourth Amendment. The purpose behind DNA testing laws is obvious: collecting and analyzing DNA samples advances the capacity of law enforcement to solve both "cold cases" and future crimes when the government has evidence of the perpetrator's DNA from the crime scene.

In a 5-4 decision, the Court, in an opinion by Justice Kennedy, upheld Maryland's DNA testing statute, and presumably the similar laws of twenty-seven other states and the federal government.

Although Justice Kennedy's opinion suggests …

Beyond Law Enforcement: Camreta V. Greene, Child Protection Investigations, And The Need To Reform The Fourth Amendment Special Needs Doctrine, Joshua Gupta-Kagan

Faculty Scholarship

The Fourth Amendment “special needs” doctrine distinguishes between searches and seizures that serve the “normal need for law enforcement” and those that serve some other special need, excusing non-law-enforcement searches and seizures from the warrant and probable cause requirements. The United States Supreme Court has never justified drawing this bright line exclusively around law enforcement searches and seizures but not around those that threaten important noncriminal constitutional rights.

Child protection investigations illustrate the problem: millions of times each year, state child protection authorities search families' homes and seize children for interviews about alleged maltreatment. Only a minority of these investigations …

The Case For Stewart Over Harlan On 24/7 Physical Surveillance, Afsheen John Radsan

Faculty Scholarship

This Article explains why the government’s physical surveillance can reach a point in terms of duration and intensity that it becomes a “search” under the Fourth Amendment. As references, Katz v. United States and Kyllo v. United States stand out from the canon. Katz, decided in 1967, swept away a prior emphasis on property rights and trespass laws to hold that the electronic monitoring of a phone booth was a search. Since then, the two-part test from Justice Harlan’s concurring opinion has received as much attention as the totality-of-the-circumstances test in Justice Stewart’s majority opinion. Kyllo, decided just months before …

Islam’S Fourth Amendment: Search And Seizure In Islamic Doctrine And Muslim Practice, Sadiq Reza

Faculty Scholarship

Modern scholars regularly assert that Islamic law contains privacy protections similar to those of the Fourth Amendment to the U.S. Constitution. Two Quranic verses in particular - one that commands Muslims not to enter homes without permission, and one that commands them not to 'spy' - are held up, along with reports from the Traditions (Sunna) that repeat and embellish on these commands, as establishing rules that forbid warrantless searches and seizures by state actors and require the exclusion of evidence obtained in violation of these rules. This Article tests these assertions by: (1) presenting rules and doctrines Muslim jurists …

Unconstitutional Police Searches And Collective Responsibility, Bernard E. Harcourt

Faculty Scholarship

Then the police officer told the suspect, without just cause, "I bet you are hiding [drugs] under your balls. If you have drugs under your balls, I am going to fuck your balls up."

Jon Gould and Stephen Mastrofski document astonishingly high rates of unconstitutional police searches in their groundbreaking article, "Suspect Searches: Assessing Police Behavior Under the U.S. Constitution." By their conservative estimate, 30% of the 115 police searches they studied – searches that were conducted by officers in a department ranked in the top 20% nationwide, that were systematically observed by trained field observers, and that were coded …