Visualisation of fingermarks and grab impressions on fabrics. Part 1: gold/zinc vacuum metal deposition

Vacuum metal deposition (VMD) is a highly sensitive technique originally introduced for detecting latent fingermarks on smooth non-porous surfaces such as carrier bags, plastics and glass. The current study explores whether VMD can be used in the examination of clothing from physical and sexual assault cases in order to visualise identifiable fingermark ridge detail and/or palmar flexion crease detail, thus allowing potential areas to be indicated for DNA swabbing and/or to determine the sequence of events. Four different fabrics were utilised during this study - nylon, polyester, polycotton and cotton, along with 15 donors who ranged in their age and propensity to leave fingermarks, from good to medium to poor as determined by results obtained from test runs using paper and plastic carrier bags processed with VMD. Once samples were collected they were kept for a determined time (1, 2, 3, 4, 5, 6, 7, 14, 21 or 28 days) and then treated using the gold/zinc metal VMD process. From the results, it appears that greater ridge detail is visible on the smoother non-porous fabrics, such as nylon whereas on rougher porous fabrics, such as cotton, only empty prints and impressions, rather than any ridge details, were visible. All fabrics did however allow the development of touch marks that could be targeted for DNA taping thus potentially leading to a DNA profile and possible identification of a suspect.     

Academic Institutions as Corporate Enterprise: Transparency,Power and Control in Staff Appraisal

Institutions of higher education, especially universities, have undergone a gradual transformation in the last 20 years or so under the pressures of accountability-related measures such as the research assessment exercise, quality assurance procedures, outcomes-based teaching and learning, and the university rankings system. These measures have led academic institutions to adopt practices that emphasize corporate management concerns. Universities are no longer regarded as institutions of learning but more as corporate enterprise. One aspect of this transformation is also seen in the implementation of staff appraisal systems and promotion exercises, which are becoming increasingly formal and less transparent, often operating behind closed doors, and privileging increased power to decision-makers. There is a resulting danger of policies and procedures being designed, constructed, and interpreted to assign maximum control to decision-makers over the outcome of such processes. This paper presents analysis of a corpus of policies, rules, and procedures being used in a number of institutions of higher education, focusing on the issues of transparency, power and control in academic appraisals and promotions, to study the extent to which these rules and procedures are likely to make the exercise transparent and assign equitable power and control to the decision-makers as well as to the staff at the receiving end.     

The illegal narcotics trade in southern Africa: A programme for action

The current policy arena with regard to drugs in South Africa is in a state of transition. Yet the burden of harm associated with drug use and the increased usage that has accompanied our changing situation necessitate, it is argued, a comprehensive drug control strategy. The paper provides an overview of previous attempts to address the problem in South Africa and presents the case for a ‘master plan’. It outlines a wide‐ranging set of factors that need to be considered, including the necessity to go beyond ‘control’ strategies to more pro‐actively dealing with demand, a move which should be underpinned by quality research.     

A preliminary investigation into the acquisition of fingerprints on food

The potential for enhancement and recovery of latent fingerprints on a variety of foodstuffs has been investigated. In general, black magnetic powder and black powder suspensions appear to be the most successful enhancement techniques with a high number of ridge detail-developed prints over a selected time scale. Banana, apple and tomato surfaces showed enhancement of latent prints but potato and egg surfaces proved to be less successful.     

Visualisation of fingermarks and grab impressions on dark fabrics using silver vacuum metal deposition

Vacuum metal deposition (VMD) involves the thermal evaporation of metal (silver) in a vacuum, resulting in a uniform layer being deposited on the specimen being treated. This paper examines the use of silver on dark fabrics, thus offering a simpler operation and more obvious colouration to that of the traditional use of gold and zinc metals which must be evaporated separately. The aim of this study was to investigate the effect of fabric type, donor, mark age and method of fingermark deposition on the quality of marks visualised using silver VMD. This was achieved by collecting fingermark deposits from fifteen donors, of both sexes and various ages, by a grab or a press method. Four different fabrics: satin, polyester, polycotton and cotton were studied over a 10 day timeline of 1, 2, 3, 4, 5, 6, 7, 14, 21 and 28 + days. It was found that satin and polyester gave the most positive results, with polyester often producing excellent ridge detail. Cotton and polycotton were less successful with no ridge detail being observed. The donors also had an observable effect on the results obtained probably due to variations in secretions produced or pressures applied during specimen collection. The age of the mark or the method of mark deposition had little influence on the results obtained. Silver VMD is a viable process for visualising marks on certain dark fabrics and has the advantage over gold/zinc VMD in that the marks visualised are light in colour which contrasts well against the dark background.