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Aaron Chalfin Profile picture
@AaronChalfin
Nov 27, 2021 • 7 tweets • 5 min read • Read on X
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There is a bunch of new research out there on the effects of body-worn cameras (BWCs) worn by police officers. Short thread summarizing four new papers 👇
Experimental evidence using precinct-level random assignment that BWCs reduced citizen complaints and increased the reporting of stops by NYC police officers by Anthony Braga, John MacDonald and James McCabe:
onlinelibrary.wiley.com/doi/abs/10.111…
Evidence from the same experiment with the NYPD that BWCs do not improve satisfaction with police officers, based on a survey of people who have had contact with the police. Paper by Anthony Braga, John MacDonald and @lmbar16: link.springer.com/article/10.100…
Using a survey experiment, @btregle, @jnixy and @JustinTPickett find that 1) police executives don't support laws that mandate the sharing of BWC footage w/ the public & 2) suspect race and armed status shaped executives' expectations of media coverage.
tandfonline.com/doi/full/10.10…
Research by @KathrynBollman finds that BWCs ▶️ 10% reduction in new case filings for offenses initiated during a police interaction but finds no effects on case disposition, sentencing or racial disparities.
github.com/katiebollman/W…
The newest meta analysis of the effects of BWCs by @MWillJr et al is here: nber.org/papers/w28622
There is another recent systematic review of BWCs by Cynthia Lum et al here: eprints.qut.edu.au/205611/

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More from @AaronChalfin

Aaron Chalfin Profile picture
Nov 26, 2022
How admissions to top universities in the US really works as revealed by a simple comparison between one of NYC's top public high schools (Stuyvesant HS) and one of NYC's top private high schools (Horace Mann School). A short thread with some basic descriptive statistics 👇👇
At @StuyNY, a public magnet school where nearly half of students qualify for NYC's free or reduced price lunch program (<$50K for a family of 4 with NYC cost-of-living), the middle 50% of SAT scores are 1490-1560. See: stuy.enschool.org/ourpages/auto/…
At @HMSchool, a private school where tuition is $60k/year (and where 85% of families pay the full tuition cost), the middle 50% of SAT scores (summing the interquartile ranges for each section) are 1380-1540. See: resources.finalsite.net/images/v163733…
Read 12 tweets
Aaron Chalfin Profile picture
Mar 3, 2022
In a field experiment in NYC, residents were provided with mundane information about local police officers. The intervention shifted residents’ perceptions of officers’ knowledge of illegal activity, and may have modestly reduced crime in the short run.👇
nature.com/articles/s4158…
Each residence in a treated area received a mailer including an outreach card and letter about a neighborhood officer describing mundane information about the officer, such as his/her favorite food, hobbies or why they became an officer.
Two months later, residents were asked how likely it is that an officer would know whether s/he did something illegal. The intervention led to a 0.13 standard deviation increase in the average resident’s belief that an officer would find out whether they committed a crime.
Read 6 tweets
Aaron Chalfin Profile picture
Mar 1, 2022
The main narrative about 2020 is that while murder rose, other crime fell. But people stayed inside more, making it hard to infer anything about public safety. In a new paper, Maxim Massenkoff & I study changes in the risk of violence while out in public.👇maximmassenkoff.com/papers/victimi…
We study violent street crimes in the three largest cities in the US. Shortly after the pandemic began, street crimes fell by 30% as the public adjusted to disease risk and lockdowns by spending more time in their homes.
But were the streets actually safer when people ventured outside? Conventional crime rates don't allow us to answer important questions like this. We measure outdoor activity using data from Safegraph, Apple & Google and find that the risk of a street crime initially rose by 40%.
Read 14 tweets
Aaron Chalfin Profile picture
Jan 24, 2022
What happens to crime in US cities when police pull back? It depends. When police reduce proactivity for reasons other than a viral incident, most papers don't find a crime increase. But when a pull back accompanies a viral incident, most papers find that crime rises. Citations👇
With respect to pullbacks which are due to dissatisfaction over arbitration agreements, the findings are mixed. See 1) academic.oup.com/aler/article-a… which finds little impact in NYC and 2) academic.oup.com/qje/article-ab… which finds increased crime in NJ.
Pullbacks which occur in the aftermath of or due to the killing of a police officer don't seem to have large public safety impacts, at least in the short-run: 1) static1.squarespace.com/static/58d9a8d… 2) dropbox.com/s/kp5226liyide…
Read 10 tweets
Aaron Chalfin Profile picture
Jan 7, 2022
The progressive prosecutor's gamble is that many offenders aren't nearly as motivated as we think they are, that the CJ system further entrenches criminal identity and that a lighter touch could actually enhance public safety. Could that be right? Thread 👇
Going back to Gary Becker (and even further than that), the cost of committing a crime has been seen as a function of the certainty of punishment and the severity of the punishment. Broadly speaking, research supports the idea that certainty deters more than severity.
This is a facile description though because certainty and severity interact. When Pr(punishment) = 0 the severity of sanction literally won't matter. When Pr(punishment) = 1, deterrence is achieved with a light sanction because you know for sure that you'll be caught.
Read 17 tweets
Aaron Chalfin Profile picture
Nov 29, 2021
The University of Chicago Crime Lab is in the market for a new Research Director! This would be an ideal job for someone who will finish their PhD in Spring 2022. As a Crime Lab alumnus, I could not recommend this job more highly. Short thread 👇
urbanlabs.uchicago.edu/attachments/09…
For someone who wants to do research that is tightly linked to policy decisions, this is an incredible opportunity. You will have access to phenomenal data and you will have the opportunity to talk to and learn from high-level policymakers as well as people working on the ground.
You'll have the opportunity to work with a fantastic cast of crime & education researchers who are doing cutting-edge crime research including @NourARazzak, @PankaBencsik, @gregstod and Ashna Arora in addition to the invaluable mentorship of Jens Ludwig and Jon Guryan.
Read 5 tweets

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