The feasibility and utility of the Terrorist Radicalization Assessment Protocol (TRAP-18) : a review and recommendations

Allely, CS ORCID: https://orcid.org/0000-0001-7640-9505 and Wicks, SJ 2022, 'The feasibility and utility of the Terrorist Radicalization Assessment Protocol (TRAP-18) : a review and recommendations' , Journal of Threat Assessment and Management . (In Press)

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Abstract

The ability to accurately predict the risk of an individual committing an act of targeted violence is likely to be impossible given the low base rate of these acts (Goodwill & Meloy, 2019). Nevertheless, prevention is possible if there is a focus on fact-based behaviors, and threat management is in place. The Terrorist Radicalization Assessment Protocol (TRAP-18; Meloy et al., 2015; Meloy & Gill, 2016; Meloy, Habermeyer, & Guldimann, 2015; Meloy, 2017) is a collection of 18 behavior-based warning signs for terror incidents. There are eight proximal characteristics and ten distal characteristics. The aim of this review was to identify studies which have utilized the TRAP-18 either prospectively (operational use) or retroactively or studies which have investigated the validity and reliability of the TRAP-18. A total of 17 relevant papers were identified in the review including six case studies and eleven empirical papers.

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