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Published on: September 28, 2018
The Clinical Threat Assessment of the Lone-Actor Terrorist
J Reid Meloy1, Jacqueline Genzman2
1San Diego Psychoanalytic Center and Department of Psychiatry, University of California, San Diego, La Jolla, CA, USA.
Abstract:
The Terrorist Radicalization Assessment Protocol (TRAP-18) is a structured professional judgment instrument for the assessment of individuals who present a concern for lone-actor terrorism. It consists of eight proximal warning behaviors and 10 distal characteristics. Previous research has demonstrated its interrater reliability and some concurrent and postdictive validity. In this article, TRAP-18 is retrospectively applied to the case of US Army psychiatrist and jihadist Malik Nidal Hasan, who committed a mass murder at Fort Hood, Texas in 2009. The strengths and limitations of TRAP-18 as a structured professional judgment instrument for mental health clinicians are discussed, and clinical risk management suggestions are made.
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