Following a high-intensity event, should officers be allowed to recover before being interviewed?
In 2014, Dr. Bill Lewinski, executive director of the Force Science Institute, sat down with Force Science News1 to explain why he recommends a 48-hour minimum recovery period: “This is the general conclusion from some 20 years of scientific research on sleep and memory consolidation. And it is the position supported by the Police Psychological Services Section of the International Assn. of Chiefs of Police, ….”2
But is the 48-hour minimum recovery still good advice?
Critics argue that delayed interviews are unnecessary, and that transparency and police accountability demand immediate interviews of those involved.
Dr. Lewinski disagrees: “A robust body of literature and the clinical experience of psychological and criminal justice professionals informs us that survivors of traumatic events can have difficulty recounting many of the elements of the incident.”
Dr. Lewinski explains: “Survivors of traumatic events aren’t just witnessing the event; they are experiencing it, and this experience can significantly affect brain function and memory.”
“Although every shooting is unique, confronting someone you believe is trying to kill you can be a significant emotional event. During these events, survivors may not consciously choose what to pay attention to. Instead, they tend to focus on the elements of the incident that were most important to their survival rather than the elements that may be important for investigation and prosecution.”
Dr. Lewinski continues: “The best investigators recognize the relationship between emotions, attention, and perception. They understand how these processes can affect encoding, consolidation, and, ultimately, memory. Even subtle factors can significantly influence memory storage. For example, the order in which we ask questions can inadvertently attach significance to that information. When someone has been involved in an emotional event, the first questions asked may be perceived as more significant, which impacts how that information is encoded and stored.”
Dr. Lewinski is impressed by advances in law enforcement investigative practices: “Law Enforcement has developed some sophisticated and clinically relevant procedures for mining the memory of someone involved in an emotionally distressing incident. As part of these protocols, delayed interviews do more than just take advantage of the consolidated memory that occurs during sleep, these delays provide temporal distance from the traumatic event and an opportunity for emotional decompression.”
Dr. Lewinski explains: “Beyond the exertion and adrenaline surge that may have occurred during an event, law enforcement is a chronically sleep deprived profession. These factors can interfere with memory consolidation and the accuracy of recall and response. Delay permits physical recovery and rest. It allows officers to return to the interview with increased cognitive clarity—resulting in a clearer understanding of the questions posed and the most complete and accurate responses.”
Dr. Lewinski warns that rushing interviews can jeopardize more than just the investigation: “Interviewing someone who has been traumatized before they’ve had a chance to decompress not only affects the quality of memories but can actually create psychological injury and significantly increase the chance of a long-term traumatic disorder.”3
Despite the advances in science, there are those who continue to ignore the effect of stress and trauma on memory formation. Dr. Lewinski laments: “Some of the researchers on memory who are attempting to influence investigations, and even some administrators and investigators, treat an officer after a traumatic event as if they calmly memorized a grocery list. This approach presumes the officer merely witnessed the traumatic event and ignores the psychological and emotional effects of experiencing trauma. This is an overly simplistic and naïve approach to sleep, stress, and human memory.”
Dr. Lewinski and the Force Science Institute continue to advance and advocate for scientifically backed investigative practices. For insight into stress, sleep, and memory, they have turned to the research of Dr. Jessica Payne. Having earned a Ph.D. in Psychology/Cognitive Neuroscience from the University of Arizona, Dr. Payne now holds appointments at Harvard Medical School and the University of Notre Dame. She is an Associate Professor of Psychology and the Director of the Sleep, Stress, and Memory (SAM) Lab at Notre Dame. Dr. Payne teaches courses in Psychology and Neurobiology and has conducted extensive research on how sleep and stress influence memory, emotion, and performance. Dr. Lewinski and the Force Science Institute are excited to announce that Dr. Payne will be a featured speaker at the August 2020 Annual Force Science Conference.
Jessica Payne, Ph.D.
Associate Professor, Department of Psychology
Cognition, Brain, and Behavior Program; Clinical Program
Dr. Lewinski: “If the goal of police interviews is a search for the truth, we want our policies and practices to be backed by good science. The decision to interview an officer immediately after a critical incident or to allow a period of recovery should be based on whichever practice will result in the most accurate and complete information for that officer.” Dr. Lewinski continued: “If sleep and recovery will not only improve memory, but improve the health and performance of officers, we should be looking at that. Dr. Payne’s cutting-edge research focuses on what’s going on in our heads while we sleep and how this impacts our memory, health, and performance.”
Dr. Lewinski was quick to point out: “This may be the first-time law enforcement hears directly from one of the leading researchers on the consolidation and storage of emotional memory. Dr. Payne will share the results of her research into how sleep affects the brain—especially those parts involved in learning, processing information, and emotion. She will describe the powerful impact that stress and emotion have on our memory and performance and provide practical advice on how to effectively manage stress and sleep. This is exactly the kind of research criminal justice professionals need as they develop investigative protocols for critical incidents.”
To hear the latest research from Dr. Jessica Payne and other top researchers, reserve your seat now at the 2020 Annual Force Science Conference, August 25-27, Radisson Blu Mall of America, Bloomington, MN.
- Chuck Remsberg. “Force Science Institute Details Reasons For Delaying Interviews With OIS Survivors.” Force Science News, May 3, 2014, https://www.forcescience.org/2014/05/force-science-institute-details-reasons-for-delaying-interviews-with-ois-survivors/. Accessed 22 May 2020.
- The IACP continues to recommend a 48-72-hour pre-interview delay. See, International Association of Chiefs of Police. 2016. Officer-Involved Shootings: A Guide for Law Enforcement Leaders. Washington, DC: Office of Community Oriented Policing Services.
- See Hope, L., Blocksidge, D., Gabbert, F., Sauer, J. D., Lewinski, W., Mirashi, A., & Atuk, E. (2016). Memory and the operational witness: Police officer recall of firearms encounters as a function of active response role. Law and Human Behavior, 40(1), 23–35. https://doi.org/10.1037/lhb0000159, (detailing how officers who were interviewed immediately after a stressful simulation doubled their pulse when asked about the threatening elements of their incident during a follow up cognitive interview) (copies of the study can be obtained here); see also Chuck Remsberg. “New Findings About Simulation Training and The Stress of Post-Shooting Interviews.” Force Science News, December 15, 2006, https://www.forcescience.org/2006/12/new-findings-about-simulation-training-and-the-stress-of-post-shooting-interviews/. Accessed 26 May 2020.