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Context manipulation in police interviews: a field experiment

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Abstract

Objectives

Recent writing and research on interrogation has highlighted the potential importance of the physical context in which the interview takes place. Whereas manuals and self-reports from police investigators indicate how they can leverage the space to maximize control over subjects, arguments for non-coercive manipulation of the room context are emerging in the literature. For instance, in laboratory settings, positive effects on interview outcomes have been demonstrated where alterations were made to the room’s physical space.

Method

In collaboration with a large American police department, interviews with witnesses to serious violent crime were randomly assigned to an experimental or control context. The experimental room was altered to create a space that was intended to be more comfortable than the control context of a standard interrogation room.

Results

Seventy-seven post-interview questionnaires were completed by detectives and 50 were completed by witnesses that included items related to the interpersonal dynamics and how much the witnesses contributed to the investigation. Although not significantly different, witnesses in the experimental room reported it as being a more comfortable setting, and there is evidence that interpersonal dynamics were actually better in the control context.

Conclusions

As the first of its kind in a police setting, this study demonstrates that it is possible to manipulate the perceptions of space within an interrogation room; however, the manipulations did not have the intended effects based on the principles of implicit cognition. Implications for future research and practice are discussed.

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Notes

  1. The Army Field Manual approaches, “Change of Scenery” and “Separation,” can also be considered related to context manipulation (see Kelly et al. 2013; Kleinman 2010).

  2. It is important to note that because the detectives work one of three shifts around the clock, these procedures were designed to be followed and administered by the detectives themselves, as it was not feasible for a member of the research team to be present at all times to ensure proper adherence to the protocol. Several measures were taken with respect to the case numbering system and how the questionnaires were collected to prevent deviation from the protocol.

  3. The Mann-Whitney non-parametric test of differences was used only for the Interview and Dynamics_W variables because these measures demonstrated problematically high (> 1) skewness statistics.

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Acknowledgments

This work was supported by the High-Value Detainee Interrogation Group (HIG) and the Federal Bureau of Investigation (FBI), contract #303-15. Statements of fact, opinion and analysis in the paper are those of the authors and do not reflect the official policy or position of the HIG, FBI or the U.S. Government. An earlier version of this research was presented at the 2017 American Psychology-Law Society meeting in Seattle, WA. The authors wish to thank the HIG and FBI, as well as the following individuals: Susan Brandon, Joeanna Arthur, and Christian Meissner for their invaluable support and feedback. We also thank the following members of the Philadelphia Police Department for their essential roles in making this study a reality: Former Deputy Commissioners Nola Joyce and Kevin Bethel, Captain Francis Healy, Captain Anthony Catalini, Captain John Walker, and Lieutenant John Anselmo.

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Correspondence to Christopher E. Kelly.

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Kelly, C.E., Dawson, E. & Hartwig, M. Context manipulation in police interviews: a field experiment. J Exp Criminol 17, 67–86 (2021). https://doi.org/10.1007/s11292-019-09389-8

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  • DOI: https://doi.org/10.1007/s11292-019-09389-8

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