For those who are interested in research-based solutions to stop police violence, here’s what you need to know - based on the facts and data. A thread. (1/x)
Lesson 1. Everything you’ve probably heard is a lie. Specifically, the most discussed “solutions” to police violence have no evidence of effectiveness. For example, Body cams don’t reduce police violence:…
2. There is no evidence that better police training programs or “implicit bias” training changes police behavior. The trainings vary in quality and rarely result in any accountability/changes in decision-making. Don’t put this at the top of your agenda. Next, what works...
3. More restrictive state and local policies governing police use of force are associated with significantly lower rates of police shootings/killings by police. This is backed by 30+ years of research. We identified specific policies that work here:
4. Demilitarization. Police depts that get more military weapons from the federal govt kill more people. You can stop that from happening through local and state policy. Montana (Red state) has gone the furthest on this. Your state can and should follow.…
5. Police Union Contracts. Every 4-6 years your police dept’s accountability system is re-negotiated. Purging misconduct records, reinstating fired officers, dept funding- it’s in the contract. Cities with worse contracts have higher police violence rates.
6. Predictive policing on the police. Yes, use the technology against them. Data on use of force, complaints & lawsuits can be used to identify officers who most likely to shoot someone next and prevent it from happening. Use the methodology to save lives.…
7. Invest in alternatives to police as crime prevention strategies. Every 10 additional organizations in a city:

- Reduces the murder rate by 9%
- Reduces violent crime rate by 6%
- Reduces property crime rate by 4%

The Research:…
8. Establish non-police alternatives to 911 calls involving people with mental illness. For example, 1 in 5 of the 911 calls in Eugene, OR are diverted to mental health first responders instead of police to respond. A success being scaled in Portland.…
9. Resource the Department of Justice (after the current president is voted out) to initiate more investigations of police departments. Departments that receive federal intervention have 25-30% fewer police shootings than those that do not.…
10. Know change is not only possible, it’s already happened in some places. Oakland police shot 8 people on avg each year 5 yrs ago and, after these interventions were implemented, they had 0 shootings this yr, 1 last yr (the officers were fired) and 0 the yr before. Lives saved.
11. Finally, we’ve catalogued an extensive range of research studies and other information detailing potential solutions to police violence at
12. And if you don’t have time to read the research right now, we’ve presented most of this research in rapid succession in this video:
In order to establish these findings we had to:
1. Build the most comprehensive database of police violence in the US
2. Conduct analyses of police use of force policies and union contracts in the 100 largest US cities
3. Track every state policing bill passed in the past 5 years
4. Track every research study published on the subject over the past five years and evaluate for quality
5. Meticulously catalogue the findings so they can be broadly accessible

And all that with little to no funding. Next up: evaluating the 1,000 largest police depts in the US.
Stay tuned. ✌🏾

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More from @samswey

Feb 10
Here are some facts about no-knock raids from the data that’s available. A thread. (1/x)
First, data on police raids is extremely limited. Nobody knows how many raids there are, no-knock or otherwise. Like other forms of police violence, there’s no national database. Surveys of police suggest 20,000-60,000 raids/year. But the data isn’t public and over a decade old.
From the data on *fatal* police raids we’ve gathered at, at least 106 civilians have been killed in police raids executing search warrants from 2013-22. At least 31 were no-knock raids. That’s an undercount - police don’t always disclose details publicly.
Read 13 tweets
Feb 6
Minneapolis Police Department.…
New York Police Department.…
San Francisco Police Department.…
Read 7 tweets
Feb 5
We just issued a Cease and Desist letter to #CampaignZero over their attempt to plagiarize our Mapping Police Violence platform. They have until next Weds to stop masquerading as Mapping Police Violence and misappropriating our work & site as their own. Here are the facts. (1/x)
I began building the Mapping Police Violence project in 2014, before I met @deray and before Campaign Zero existed. The first time he found out about my project was in this email on February 4, 2015.
Note that We The Protesters (which later became Campaign Zero) first became an organization after filing for incorporation on June 29, 2015. And Campaign Zero didn’t exist until August 21, 2015. There was no actual CZ/WTP organization when MPV was created and launched.
Read 12 tweets
Feb 4
There are more than 2,400 elected prosecutors in America. Keith Ellison is *1 of only 4 prosecutors* who has prosecuted and convicted officers in two separate incidents where police killed someone in the past 9 years.
The 4 prosecutors who’ve convicted officers in two separate police killings are Keith Ellison (MN), Faith Johnson (Dallas), Paul Howard (Atlanta), Steve Kunzweiler (Tulsa). 3 of them are Black despite fewer than 5% of all prosecutors being Black. 2 were elected out of office.
Source: the Mapping Police Violence organization (
Read 5 tweets
Feb 1
🚨After @Nettaaaaaaaa and I called for accountability for #CampaignZero, @deray is trying to forcibly take over the Mapping Police Violence database that I and my team have built for *years* - redirecting it to a COPY he has no capacity to maintain in an act of retaliation. 🚨
Before I even met Deray and before Campaign Zero existed, I began building Mapping Police Violence to give communities data to fight back against police violence. It has since become among the most cited resources in the space. The real site is still here:
I never thought his animosity over my leaving CZ would cause him to retaliate like this. The fact that we’ve been working on this database for months *unpaid* while he keeps fundraising $40M+ on our work - and on the movement - is shameful. AND on the first day of BHM!
Read 11 tweets
Jan 25
The simplest explanation for this is that the high-profile murder of civilians by police traumatizes and destabilizes communities, which leads to increases in crime. Police violence periodically generates crime in communities.
This has nothing to do with police “pulling back.” It has to do with police aggression leading to catastrophic results for communities. Population-wide effects of police violence on community health, particularly in Black communities, are well-documented:…
What’s particularly pernicious about the “scholarship” on this issue is that a group of criminologists is advancing a theory that police are *not being aggressive enough* after murdering someone that that causes crime to increase. The exact wrong conclusion to draw from the data.
Read 7 tweets

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