The quantification of fingerprint quality using a relative contrast index

Research into fingermark enhancement techniques has traditionally used visual comparisons and qualitative methods to assess their effectiveness based on the quality of the developed fingermark. However, with increasing research into the optimisation of these techniques the need for a quantitative evaluative method has arisen. Parameters for acceptable fingerprint quality are not well defined and generally encompass clear, sharp edges and high levels of contrast between the fingermark ridges and background material. Using these current parameters, a conclusive measurement of fingerprint quality and thus the effectiveness of development techniques cannot be achieved.This study presents a model through which an aspect of fingerprint quality can be objectively and impartially measured based on a relative contrast index, constructed through measuring the reflective intensity of the fingermark ridges against the background material. Using a fibre-optic spectrophotometer attached to a microscope with axial illumination, the intensity counts of the ridge detail and background material were measured and a logarithmic contrast index constructed. The microscope and spectrophotometer parameters were experimentally tested using a standard colour resolution chart with known reflective properties. The protocol was successfully applied to four sample groups: black inked fingerprints on white paper; latent fingermarks on white paper developed separately with ninhydrin and physical developer; and fingermarks in blood deposited on white tiles and enhanced with amido black. The contrast indices obtained quantitatively reflect the level of contrast and provide an indication of fingerprint quality through a numerical representation rather than previous qualitative methods. It has been suggested that the proposed method of fingerprint quantification may be viable for application in the forensic research arena as it allows the definitive measurement of contrast to aid the evaluation of fingermark detection and enhancement techniques.     

Law and Market Economy: The Triadic Linking of Law,Economics, and Semiotics

International Journal for the Semiotics of Law - Revue internationale de Sémiotique juridique -     

Virtual law school

This is an account of how legal education may look in 25 years time. It is written in a science fiction style which seems appropriate for a futuristic piece. The account focuses on the central role that information technology will undoubtedly play in the law schools of the future and, in particular, on the crucial part that the Law Courseware Consortium may take in the ‘computerization’ of legal education.     

People with special needs and sexual behaviour problems: balancing community and client interests while ensuring effective risk management

Abstract

Deinstitutionalisation movements of the mid-1900s led to changes in policy and practice in the management of people with special needs (defined for this article as people with severe and persistent mental illness, intellectual disabilities and high levels of personality factors that interfere with treatment participation). Although the majority of clients with special needs receive care in community settings and interact more with family, friends and others in the community, some such clients require more rigorous case management. For clients who have offended, especially sexually, community-based services are scarce, and concerns regarding reoffence potential often supersede traditional understandings of diminished capacity. Recent reports suggest that jails and prisons have replaced hospitals as the institutions-of-choice for clients with special needs who engage in inappropriate conduct. This paper examines policies and practices regarding community risk management of people with special needs who have sexually offended. Vignettes are provided to illustrate how some clients and agencies have been affected, and suggestions are made to ensure best practices in risk management and public safety.     

Vernacular rights cultures and the ‘Right to Have Rights’

We use a case study of the Landless Workers Movement (MST) in Brazil and the Via Campesina network of which they are part to develop the concept of ‘vernacular rights cultures’. Vernacular rights cultures calls attention to the way in which demands for the right to have rights call on particular cultures, histories and political contexts in a manner that can transform the rights inscribed in constitutions and political imaginaries. What Ranciere (1999) and Balibar (2002) call the democratisation of democracy, we therefore argue, does not just involve a logic of equality and inclusion through which dispossessed groups demand already existing rights. Rather, it also occurs as mobilisations alter the means through which rights are delivered and transform the content and meaning of the rights demanded.