Forensic applications of infrared chemical imaging: multi-layered paint chips

This paper examines the potential of infrared chemical (hyperspectral) imaging as a technique for the forensic analysis of automotive paint chips in particular, and multicomponent (e.g., layered) samples in general. Improved sample preparation procedures for the infrared analysis of paint chips are detailed, with the recommendation that where mounting resins are chemically incompatible with the sample, it is better to mount and section the sample in a soft wax from which the sections can be removed and pressed into a KBr disk for transmission analysis. Infrared chemical images of multilayered paint chips have been successfully obtained, with the chief advantage over conventional infrared analysis being that thousands of infrared spectra are collected in a few minutes across the whole sample, at a spatial resolution of around 5 microm. As with conventional infrared spectroscopy, chemical species can be identified from their spectra, but the wealth of information available can be also extracted in a number of different ways that make multicomponent spectral (and hence chemical) comparisons between two samples easy to visualize and understand. In one approach, the infrared chemical images of two paint chips being compared side-by-side can be viewed as a "movie," in which each frame is an intensity map of the two samples at a given wavenumber (frequency) value. In another approach, the spectra (pixels) in the image files are classified into chemically similar groups, resulting in a "cluster" image that makes it possible to simultaneously compare all of the layers in two paint chips. These methods are applicable to other multicomponent samples, and also to other chemical imaging techniques.     

Hindsight bias and third-party consentors to warrantless police searches

Research on hindsight bias indicates that awareness of event outcome influences how individuals interpret information and form judgments. We extend this earlier work to suggest that the effect of this bias on lay perceptions of third-party consent to warrantless searchers of residences may be contingent upon the presence verus absence of the search target(the suspect). A study using random assignment to experimental conditions in a between-subjects design explored this possibility. The experiment indicated that hindsight bias in perceived rights of the third-party consentor is influenced, not only by search outcome, but also by a web of overlapping and potentially competing social obligations and personal prerogatives, the salience of which is influenced by situational dynamics.Portions of this research were reported in a panel session at the 1989 meeting of the American Society of Criminology, Reno.     

Collaborative research as an anti-poverty tool: a research partnership between police and indigenous Australians

This paper reports on a collaborative research project that shows how participatory social research can be used as a strategy for combating social exclusion. The Crime Prevention Partnership Project brought together dominant and disempowered groups to explore social issues of mutual concern and identify potential solutions. Indigenous Australian undergraduate students played a central role in this project, working with the police as customer service trainees and with the university as members of a project research group. This project became an opportunity to train and empower new researchers who, as people from disadvantaged groups, brought their own knowledge, concerns, and worldviews to a research process that they helped design and carry out themselves. The result was a learning process for all involved, referred to here as multi-directional empowerment. It led to tangible bridge building between mainstream, powerful institutions and a disadvantaged community. The project process offers a model for using participatory research as a framework in which to address development issues.     

Incarcerated mothers and parenting

This paper describes as a primary prevention strategy, a parent-education program aimed at enhancing the parenting skills and knowledge of incarcerated women (the majority of whom were mothers). Data are presented which describe changes in program participants' self-evaluations, parenting attitudes, and expectations of children. Upon completing of the parenting program, few differences were observed for the various pre- and post-test measures. Specifically, the analysis indicated that participants' self-esteem improved slightly but that participants appeared to regress in such parenting attitudes as beliefs in the use of corporal punishment as a means of discipline. The need for further examination of the area of parenting attitudes and practices of incarcerated mothers is underscored.