Observer determination of the make,model, and year of questioned vehicles

Often, criminal acts involving a vehicle are caught on digital video surveillance systems. While potentially useful for an investigation, the recording conditions are typically less than optimal for the extraction of key information for the identification of the perpetrator, such as a license plate. Providing the make, model and year of a questioned vehicle is a common request for examiners, to narrow the field of potential suspect vehicles. This study seeks to compare the performance of a nonpeer-reviewed make, model, and year determination between two separate groups, specifically, trained forensic image examiners and nontrained individuals. Results show that even with varied image capture conditions and quality, the trained forensic image examiners more correctly and completely identified the test group of questioned vehicles make, model, and year.     

Microscopic characteristics of hacking trauma

The purpose of this study was to determine if it is possible to associate machetes, axes, and cleavers with the microscopic parallel striations they leave on the cut surfaces of the bone. Hacking trauma was experimentally inflicted on pig bones using machetes, axes, and cleavers. Negative impressions of both the cut surfaces of the bone and the weapon blades were analyzed using scanning electron microscopy. The results of this investigation indicate that it is possible to correlate a class of hacking weapons to trauma inflicted on bone by these weapons.     

The dimensions of dangerousness revisited

In this article, we extend our previous study on clinical predictions of violence using the Dangerous Behavior Rating Scale by increasing follow-up interval from 2 to 6 years and supplying new data on prediction-outcome correlations for multidiscipline assessors. A total of 162 accused persons remanded for evaluations at METFORS were assessed using three criterion measures: subsequent violence, criminality, and general incidents. Statistical analyses revealed a range of predictive performance, contingent on several conditions including the identities of evaluators, categories of subjects, and length and context of follow-up. Even prognostications yielding the highest magnitude coefficients, reaching 53 in the case of psychometric forecasts of behavior in psychiatric hospitals, failed to account for more than 28% of the prediction-outcome covariance. Implications of the results are considered for the future role of the dangerousness construct.The research project described in this article was funded by the Social Sciences and Humanities Research Council of Canada, the Canadian Psychiatric Research Foundation, the Solicitor General Canada, the LaMarsh Research Program on Violence and Conflict Resolution, the Ontario Ministry of Health, Simon Fraser University, the Clarke Institute of Psychiatry, and the psychopathy project supported under the sustaining grant provided by the Solicitor General, Canada, to the Centre of Criminology, University of Toronto. Thanks for their perceptive commentaries to Ronald Roesch and the two anonymous reviewers ofLaw and Human Behavior. Acknowledged as well are the contributions of the many research assistants and representatives of mental health, police, justice, and correctional agencies who collaborated in the compilation of these data. Research assistance was provided by Michelle Grossman, Simon Hanbury, Lily Keoskerian, Ed Tymosiak, and Cheri Wilner. Bill Glackman offered technical help with the data analysis. A version of this paper was originally presented at the 1991 Meeting of the American Society of Criminology in San Francisco.Clarke Institute of Psychiatr