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.     

Using GIS to evaluate post-release prisoner services in Newark, New Jersey

Discharge planning is increasingly prioritized by correctional systems in order to prepare prisoners for their reintegration into society. A goal of discharge planning is to link prisoners with appropriate service providers in the community to meet their needs. A successful discharge plan requires that an optimal level of services exist and work in a coordinated and collaborative way in order to ensure a continuum of care and treatment during the reentry process (Queralt & Witte, 1999). This study utilized Geographic Information System (GIS) to assess the size, demographic characteristics, and needs of the Newark, New Jersey parolee population with the availability, location, and characteristics of health and human service agencies servicing their needs. A random sample of parolees (N = 800) released in 2006 was selected for this study. Social service agency data were obtained from an on-line service agency data base. Results of the analysis include the degree of spatial distribution, accessibility, and availability of services to where the parolees live and the degree of spatial overlap of specific services in an area.     

THE VALUE OF THE REMUNERATION OF HIGH CIVIL SERVANTS IN BRITAIN IN THE 20TH CENTURY AND ITS IMPLICATIONS

The article traces a large real and comparative decline in the rewards of high civil servants in Great Britain over the 20th century, accelerating since about 1970. It relates this to developments in the market for ‘high quality’ graduates and to changes in public and governmental attitudes which have affected the size, organization and role of the civil service. It discusses possible causes of the decline in top rewards in terms of three explanatory approaches suggested by social scientists – the ‘institutional’, the ‘cultural’, and the views of the ‘Chicago School’. Finally, following an examination of changes in the way senior British civil servants are now recruited and remunerated, it considers possible outcomes in terms of effects on the part they can play in the governmental process.     

Interrogation of short tandem repeats using fluorescent probes and melting curve analysis: A step towards rapid DNA identity screening

Current forensic DNA profiling methods rely on the analysis of samples at specialised laboratories with an average turnaround time of several days. The ability to rapidly determine a partial profile of short tandem repeats at the point-of-arrest would be of great benefit to police forces around the world, for example enabling a suspect to be rapidly included or excluded from an investigation. We have developed a homogeneous PCR method for the interrogation of STR loci utilising fluorescent oligonucleotide probes and melting curve analysis. Alleles of the D18S51, TH01 and D8S1179 loci were differentiated and identified on the basis of target length and probe melting temperature. Assay performance was evaluated by comparing melting peak data with the AmpFlSTR^® SGM Plus^® system. The method is compatible with direct analysis of unpurified buccal swab samples, enabling a partial STR profile to be generated within 1 h.