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Psychological markers underlying murder weapon profile: a quantitative study.

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Psychological traits significantly influence the weapon choices of male murderers, impacting the number, source, and type of weapons used. This research aids in the psychological profiling of offenders in Malaysia.

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Area of Science:

  • Criminology
  • Forensic Psychology
  • Behavioral Science

Background:

  • Weapon usage is critical in murder investigations, yet psychological factors influencing choices remain under-researched.
  • Existing studies focus on environmental, demographic, and availability factors, neglecting the perpetrator's psychological profile.

Purpose of the Study:

  • To investigate the influence of psychological traits on weapon selection among male murderers.
  • To bridge the gap in understanding the psychological underpinnings of weapon usage in criminal behavior.

Main Methods:

  • Cross-sectional study of 71 male murderers in 11 Malaysian prisons.
  • Utilized a guided self-administered questionnaire with sociodemographic data and validated psychometric instruments.
  • Employed independent sample t-tests, Kruskal-Wallis tests, and one-way ANOVA to analyze psychological trait differences related to weapon usage.

Main Results:

  • Specific psychological traits were found to significantly influence the number, source, and type of weapons used.
  • Differences in psychological profiles were observed between murderers using single versus multiple weapons.
  • Variations in psychological traits correlated with different weapon sources.

Conclusions:

  • Psychological functioning is a key determinant in weapon selection during murder.
  • Findings offer valuable insights for the psychological profiling of unknown offenders within the Malaysian context.
  • Highlights the need for integrating psychological assessments in criminal investigations involving weapon use.