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Glenn College Researcher Analyzes Police Traffic Stop Data

News Type College News

Glenn College senior research scientist Robin Engel announces the results of the data analysis at a Pennsylvania State Police press conference. (Credit: Pennsylvania State Police)

Glenn College senior research scientist Robin Engel and colleagues conducted an independent analysis of data collected from all Pennsylvania State Police trooper-initiated traffic stops in 2023, the latest findings of a voluntary, extensive data collection program focused on improving policy, training, public trust and the safety of motorists and troopers. 

“The independent analysis by Dr. Robin Engel and her team found our department continues to have one of the most comprehensive and high-quality data collection efforts in the country, reinforced by the successful implementation of recommendations to improve training, refine data collection and examine traffic stop patterns and trends,” Col. Christopher Paris, Commissioner of the Pennsylvania State Police said in a news release. “Pennsylvanians should rest assured that the PSP is committed to professionalism, transparency and equitable law enforcement practices.”

The Pennsylvania State Police became one of the first police agencies to voluntarily collect traffic-stop information when the department first partnered with Engel in 1999 and continued voluntary reporting of traffic stops through 2010. The department reinitiated robust data collection for all trooper-initiated traffic stops in 2021. The latest report was released Aug. 14.

Shifting the Paradigm

John Glenn College of Public Affairs faculty and the Columbus Division of Police aspire to improve policing by safeguarding constitutional rights while building trust between officers and the community. In the newest edition of the college magazine, Public Address, our “Shifting the Paradigm” stories explain ways the college expertise is bringing science, data collection and education to an effort that’s caught the attention of police departments across the country who want to implement the model.

Engel ranks among the top academics nationally in criminal justice and criminology, with expertise in empirical assessments of police behavior, use of force, police-minority relations and criminal justice policies. She also is an adjunct professor of criminal justice at the University of Cincinnati.

“The Pennsylvania State Police’s continued investment in a comprehensive and accurate data collection process adds confidence to our statistical findings of no or minimal racial and ethnic disparities across PSP’s traffic stop enforcement actions,” said Engel. “This level of transparency and accountability is an important step for maintaining public trust and confidence in law enforcement and should serve as a model for other police agencies across the Commonwealth.”

Pennsylvania State Police’s contact data collection includes the legal reason for each traffic stop, characteristics of the vehicle and driver, and whether the stop resulted in a warning, citation, or arrest. If the vehicle was searched, troopers document the reason and outcome.

Pennsylvania State Police implemented recommendations Engel made in last year’s report, including: 
•    The creation and refinement of expanded data fields related to the reason for the stop and other items helpful in the analysis.
•    Evaluation of the data by troop and area commanders, allowing for ongoing review and identification of any errors in data entry.
•    Continued review and refinement of training to include the Safe Highways Initiative through Effective Law Enforcement and Detection.
•    Improvements to oversight and accountability, including the continued rollout of body-worn cameras and upgrades to PSP’s Blue Team system, which allows citizens to view the real-time status of complaints submitted.

The complete 2023 report can be found on the Contact Data Reporting page of the Pennsylvania State Police website.