Cases are identified through a variety of sources and then assigned to a team of two coders. These two individuals code each case for over 50 variables and then compare their answers. Any discrepancies are negotiated and decided upon using the Codebook. The cases are then verified by a third coder, who checks to make sure all of the variables are correct and that there are no inconsistencies. Finally, the case is validated by one of the tPP auditors.
As of September 2023, tPP’s dataset includes 3,729 completed cases! These cases have been researched by two coders, verified by a third coder, and are in the process of undergoing a final audit. Each case is cross-referenced with a series of court documents, newspaper accounts, and other sources.
We also have over 5,300 cases that are in the process of being coded or have been excluded. These cases include:
- 1,745 cases in the process of being investigated and coded by 12 teams
- 273 cases coded to completion with sentencing details pending
- 98 cases identified for likely inclusion but not yet investigated
- 214 cases from a single mass indictment coded and awaiting demographic information
- 141 cases identified, investigated, and coded for exclusion
- 1,717 cases in the process of being investigated and coded in relation to the Summer-Fall 2020 George Floyd Protests
- 1,191 cases in the process of being investigated and coded in relation to the Winter 2021 Capital Siege
Counting it all up, there are 9,108 total cases in the tPP universe so far!
…..We’ve also set aside more than 50 documents and archives (over 2,000 pages of reporting) to scrape for additional cases.
Whenever possible, tPP aims to add and code cases based on primary sources and government documents. Our dataset includes information derived from a variety of such sources including:
- Court Documents
- Government press releases
- Intelligence bulletins
- Reports from:
- Congressional Research Service, Customs and Border Protection, Department of Homeland Security (including fusion centers), Department Of Justice, Department of State, Federal Bureau of Investigation, National Consortium for the Study of Terrorism and Responses to Terrorism (START), National Counterterrorism Center, National Institute of Justice, Senate Intelligence Committee, U.S. Attorney’s Office, U.S. Senate/House of Representatives’ subcommittees and testimonies, United Nations…
- We also use triangulated secondary sources when primary sources are not available. Typically these are news or academic articles.
tPP researchers have already completed the cross-referencing, assimilation, & re-coding of cases located in the following databases & reports:
- Ari Weil, George Floyd Vehicle Ramming Dataset, June 19 2020 Export
- Center for Investigative Reporting report Homegrown Terror: 2008-2016 (201 cases)
- Charles Kurzman’s Muslim-American Involvement with Violent Extremism, 2001-2018,? Triangle Center on Terrorism and Homeland Security (912 cases)
- Counter Extremism Project, Terrorists and Extremists Database (144 cases
- Human Rights Campaign’s Hate Crimes: A chronology of hate report (650 cases)
- Institute for Social Policy and Understanding report Equal Treatment: Measuring the Legal and Media Responses to Ideologically Motivated Violence in the United States? (2018)
- Mother Jones’ Database of Post-9/11 Domestic Terrorist Prosecutions (508 cases)
- National Abortion Federation database on violence targeting abortion facilities
- New America’s report Terrorism in America after 9/11 (397 cases)
- New Jersey Office of Homeland Security and Preparedness:
- Project SALAM and National Coalition to Protect Civil Freedoms’ database, Inventing Terrorists: The Lawfare of Preemptive Prosecution (1227 cases)
- RAND Database of Worldwide Terrorism Incidents
- RAND’s reports including, Incidents of Jihadist Terrorist Radicalization in the United States Since September 11, 2001
- The Anti-Defamation League reports
- The Intercept’s The Threat Within project (338 cases)
- The Intercept’s Trial and Terror project (850 cases)
- The Investigative Project on Terrorism‘s case archive
- The George Washington University’s Program on Extremism’s”
- The Muslim Public Affair Council’s Database of Post-9-11 Prosecutions (194 cases)
- The Violence Project Mass Shooter Database v. 1 and v. 2 (173 cases)
- Southern Poverty Law Center reports, including Age of the Wolf: A Study of the Rise of Lone Wolf and Leaderless Resistance Terrorism (2015)
- United Nations Office on Drugs and Crime report, Digest of Terrorist Cases (2010)
- University of Maryland’s START’s (National Consortium for the Study of Terrorism and Responses to Terrorism) Global Terrorism Database
- U.S. Department of Justice reports including: