The story of immigration enforcement

In an award-winning paper, criminologist Aaron Chalfin examines the public safety implications of labor market-based immigration enforcement.


COVID-19, protests, and crime

During a summer internship with the Law School’s David Abrams, rising sophomores Caroline Li and David Feng looked at how the COVID-19 pandemic and last summer’s racial justice protests affected America’s crime rate. 

Kristen de Groot

Annenberg researchers use data science skills for social justice

Data scientists at the Annenberg School for Communication are working with the Amistad Law Project to create an open access dashboard of data that can aid efforts to help the incarcerated communiy.

From Annenberg School for Communication, Ashton Yount

The Quattrone Center: Less argument, more truth-seeking

The Quattrone Center for the Fair Administration of Justice is pioneering a systemic, data-driven approach to criminal justice reform. Its executive director, John Hollway, started with the idea that the law should function more like science.

The Pennsylvania Gazette

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In the News

LA Times

California homicide rise becomes recall rallying cry, but experts question Newsom’s role

Aaron Chalfin of the School of Arts & Sciences comments on how the surge in crime rates is more complicated than what political attack ads suggest and extends beyond the policies of one governor or state.


The New York Times

Biden’s honeymoon is over, and he knows it

Aaron Chalfin of the School of Arts & Sciences said it would be risky for Democrats to engage in a debate over crime, as the recent uptick in violence “has reversed 20 years of progress in just 18 short months.” He said that although it “has little to do with Democratic political priorities at the national level, it seems likely that the Democrats will be held to account given the rhetoric around ‘Defund’ that is associated with the left wing of the party.”


Philadelphia Inquirer

Philadelphia home repair grants linked to decreased neighborhood crime, Penn study finds

Researchers from the Perelman School of Medicine, School of Arts & Sciences, and Stuart Weitzman School of Design found that the crime rate on a given block was reduced by nearly 22% when the city of Philadelphia funded repairs for even a single house. “The social fabric of a neighborhood is very connected to the physical environment,” said the medical school’s Eugenia South.


BBC News

A weekend in America: Shootings in Washington spotlight growing problem

David Abrams of the Law School spoke about rising crime rates in the U.S. "Homicides are, in most of these cities, outpacing—and in some cases by a lot—rates that we've seen for the last several years," he said. "It's pretty widespread. This is not just a D.C. phenomenon. It's not just a Chicago phenomenon."


Philadelphia Inquirer

Homicides are up, but GOP misleads with claims about blame

David Abrams of the Law School spoke about fluctuating crime rates during the pandemic. “Any theory explaining the rise in homicides would also have to explain why we haven’t seen a spike in other kinds of crimes,” he said.


The Atlantic

America’s dangerous obsession with innocence

Marissa Bluestine of the Law School’s Quattrone Center for the Fair Administration of Justice spoke about the numerous innocence organizations working to exonerate wrongfully convicted people on death row in the U.S.