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 …

No Runs, Few Hits And Many Errors: Street Stops, Bias And Proactive Policing, Jeffrey A. Fagan

Faculty Scholarship

Equilibrium models of racial discrimination in law enforcement encounters suggest that in the absence of racial discrimination, the proportion of searches yielding evidence of illegal activity (the hit rate) will be equal across races. Searches that disproportionately target one racial group, resulting in a relatively low hit rate, are inefficient and suggest bias. An unbiased officer who is seeking to maximize her hit rate would reduce the number of unproductive stops toward a group with the lower hit rate. An unbiased policing regime would generate no differences in hit rates between groups.

We use this framework to test for racial …

Terry'S Original Sin, Jeffrey Fagan

Faculty Scholarship

In Mapp v. Ohio, the U.S. Supreme Court extended the due process protections of the exclusionary rule to include all "constitutionally unreasonable searches" that were done without a basis of probable cause. In the seven years after Mapp, when homicide rates in the U.S. nearly doubled, riots broke out in at least forty-seven U.S. cities. During the same era, a heroin epidemic gripped the nation's urban centers, giving rise to street drug markets and associated violence and pressures on law enforcement to curb those markets. As violence increased, a turn in the nation's political culture questioned Mapp's restraints on …

Probabilities, Perceptions, Consequences And "Discrimination": One Puzzle About Controversial "Stop And Frisk", Kent Greenawalt

Faculty Scholarship

A troubling aspect of the practice of "stop and frisk" in New York and other cities is the evidence that this police tactic is employed predominantly against young men in racial minorities. On August 12, 2013, the federal district court ruled in Floyd v. City of New York that New York's practices and policies regarding stop and frisk violated the Equal Protection Clause of the Fourteenth Amendment and its Due Process Clause, which makes the Fourth Amendment ban on "unreasonable searches and seizures" applicable against the states. Judge Shira A. Scheindlin found that a number of specific stops and subsequent …

Street Stops And Police Legitimacy: Teachable Moments In Young Urban Men's Legal Socialization, Tom Tyler, Jeffrey Fagan, Amanda Geller

Faculty Scholarship

An examination of the influence of street stops on the legal socialization of young men showed an association between the number of police stops they see or experience and a diminished sense of police legitimacy. This association was not primarily a consequence of the number of stops or of the degree of police intrusion during those stops. Rather, the impact of involuntary contact with the police was mediated by evaluations of the fairness of police actions and judgments about whether the police were acting lawfully. Whether the police were viewed as exercising their authority fairly and lawfully shaped the impact …

Street Stops And Broken Windows: Terry, Race And Disorder In New York City, Jeffery Fagan, Garth Davies

Faculty Scholarship

Patterns of "stop and frisk" activity by police across New York City neighborhoods reflect competing theories of aggressive policing. "Broken Windows" theory suggest that neighborhoods with greater concentration of physical and social disorder should evidence higher stop and frisk activity, especially for "quality of life" crimes. However, although disorder theory informs quality of life policing strategies, patterns of stop and frisk activity suggest that neighborhood characteristics such as racial composition, poverty levels, and extent of social disorganization are stronger predictors of race- and crime-specific stops. Accordingly, neighborhood "street stop" activity reflects competing assumptions and meanings of policing strategy. Furthermore, looking …

Police Patrol, Judicial Integrity, And The Limits Of Judicial Control, Debra A. Livingston

Faculty Scholarship

I want to thank St. John's for inviting me to be part of this reexamination of Terry v. Ohio – and particularly for this opportunity to participate in a roundtable discussion on the relationship between stop and frisk doctrine and the substantive law. This is an important and timely topic and I am happy to see it being discussed in such a serious venue.

When I was preparing my remarks for today, I thought I should call them, "Terry and the Substantive Law: A Hard, Hard Problem." Fortunately, I have sworn off titles with colons, so I settled on "Police …