Prosecutor Accountability through Data Transparency: Cook County Felony Case Processing Data Visualization

Why does Prosecutor Data Collection and Transparency Matter?

Transparency into prosecutorial decision-making is critical to ensuring that a prosecutor's office is accountable to the people it serves. For example, prosecutors can use data to assess whether current policies are being applied consistently, ensure that resources are appropriately focused for fair and equitable outcomes, and develop new policies that can address community concerns, such as racial disparities in the criminal legal system. Moreover, by making their data publicly available, prosecutors can empower the public to assess information about how cases are being processed within their communities and to better understand the role of the prosecutor in the criminal legal system.

Ultimately, prosecutor data transparency is essential for building community trust, ensuring the legitimacy of the prosecutorial function, and working towards a more just and equitable criminal legal system.


Data Collaborative for Justice (DCJ) Felony Case Processing Data Visualization Tool

The Cook County State's Attorney's Office (SAO), one of the nation's largest prosecutor's offices, recently released data on the handling of felony cases from 2011 to present. Using the Cook County felony case data, the Data Collaborative for Justice (DCJ), a non-profit criminal justice research organization, developed a data visualization that enables the public to analyze how cases prosecuted by the SAO move through the criminal legal system.

DCJ's Felony Case Processing Data Visualization Tool (see "Explore the Data" above) allows users to view outcomes at three key stages of the felony cases process:

  1. Felony Case Initiation - following an arrest, most cases go through a process known as felony review, in which the SAO makes a decision whether or not to prosecute. Cases may also be indicted by a grand jury or, in narcotics cases, filed directly by law enforcement.
  2. Case Disposition - Cases may be disposed in a variety of ways, including because a person pled guilty, was found guilty at trial, or the prosecutor decided not to proceed with the case.
  3. Sentencing - if a person is found guilty (either at trial or due to a plea), they can receive a variety of sentences, such as probation or prison.

To use the data visualization tool, select "Explore the Data" above. The Explore the Data page is organized into four tabs:

  • The Felony Case Processing Tree: This tab shows outcomes by charge type and allows users to see differences in outcomes by race and ethnicity/age/gender as well as filter cases by various timeframes.
  • The Felony Case Processing Table: This tab shows, for various charges types (e.g., homicides, narcotics cases), the outcomes by percent at each of three key stages of the felony case process (Felony Case Initiation, Case Disposition, Sentencing).
  • Changes to Charge Severity Graph & Table: This tab shows how frequently the severity of a person's charge increased or decreased between case initiation and case disposition.
  • Data & Definitions: This tab provides definitions of the outcomes presented by DCJ's Data Visualization Tool as well as additional details about the data.

DCJ is grateful for the assistance of the Cook County SAO in responding to DCJ's questions and inquiries during the development of the Felony Case Processing Data Visualization Tool. DCJ is particularly appreciative of the assistance provided by Matthew Saniie, SAO's Chief Data Officer, and Lisa Li, SAO Data Integration Analyst.


To better understand the case processing in Cook County, please refer to:
- Case Processing Overview in Cook County, a Flowchart
- Cook County State's Attorney Data Report of 2017, with Detailed System Term Definition
- Cook County State's Attorney Data Dashboard
- Cook County State's Attorney Open Data Guide
- Cook County State's Attorney Open Data Glossary

For the best experience, please visit this site in a wide screen desktop browser. If the tree gets cut off, please zoom out. Also if the visualization is difficult to view, please consider a different browser or clear the cache on the current browser.
2011 - 2022
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Click on the nodes to examine the case processing points by race/ethnicity, gender, and age.

*** Race group 'Other' includes Asian and Native American.