Particle size analysis of sediments, soils and related particulate materials for forensic purposes using laser granulometry

Particle size is a fundamental property of any sediment, soil or dust deposit which can provide important clues to nature and provenance. For forensic work, the particle size distribution of sometimes very small samples requires precise determination using a rapid and reliable method with a high resolution. The Coulter trade mark LS230 laser granulometer offers rapid and accurate sizing of particles in the range 0.04-2000 microm for a variety of sample types, including soils, unconsolidated sediments, dusts, powders and other particulate materials. Reliable results are possible for sample weights of just 50 mg. Discrimination between samples is performed on the basis of the shape of the particle size curves and statistical measures of the size distributions. In routine forensic work laser granulometry data can rarely be used in isolation and should be considered in combination with results from other techniques to reach an overall conclusion.     

Through a glass darkly: Cause and effect in refugee resettlement policies

As the ongoing debate among philosophers and social scientists suggests, interpretation of cause and effect in human action is often extremely difficult. Especially complicated for the policy analyst is the problem of determining whether causal relationships are inferred from the evidence or imputed to it. This dilemma characterizes certain types of government activity in which distinctions between policy and implementation, between decisions and actions, and between inputs and outcomes are unclear. The efforts of the federal government between 1960 and 1985 to assist refugees in securing employment illustrate how the flow of events may elude causal explanation, and how conclusions and recommendation for improvement derived from the evidence may prove highly ambiguous. In such instances the most rational course open to policy analysts may be to concede ignorance.     

Dilution in the US, Europe, and beyond: international obligations and basic definitions

Legal context. The efficacy of trade mark dilution as a causeof action has been cast into doubt by the Supreme Court's actualdilution standard. However, Congress is currently consideringthe Trademark Dilution Revision Act 2005, removing the actualdilution standard and resolving other difficulties under thepresent Lanham Act 43(c). This should breathe new life intoblurring and tarnishment. It should also be recalled that theEU already has strong laws against dilution and unfair advantage. Key points. This article identifies international dilution obligationsin order to determine (in Part II) whether the US and EU arecompliant. It identifies problems under the present US dilutionlaw and the solutions offered by the Revision Act. It comparesthe US proposals with EU dilution protection to determiningwhat the two jurisdictions have to learn from each other. Thistheme will be continued in the next part of this article, whichfocuses specifically on blurring/detriment to distinctive character. Practical significance. The introduction of new US legislationwill make successful dilution claims easier and will increasethe frequency of actions under 43(c). It is vital that trademark lawyers are familiar with the changes. At the same time,it should be remembered that many of the same outcomes can beachieved under the current European legislative provisions.To the extent that the jurisdictions do not live up to theirinternational dilution obligations, there is scope for proprietorsto lobby for even stronger protection.     

Detergent: an alternative approach to traditional bone cleaning methods for forensic practice

Osteological assessment of human remains forms an essential part of forensic work, especially during the examination of extensively decomposed, dismembered, or burnt bodies. Currently employed methods for removal of adherent soft tissue reflect practices often used by museum curators, notably insect consumption, enzymatic maceration, or boiling of the bones, with subsequent manual removal of material. This study was designed to assess the effectiveness of detergents for the purpose of soft-tissue removal from animal-derived specimens. The results indicate that such a means is comparable to enzymatic maceration but with fewer health and safety issues and greater advantages regarding transportation and availability of materials when an investigator is in a fieldwork scenario.     

Gamma hydroxybutyric acid (GHB) concentrations in humans and factors affecting endogenous production

The endogenous nature of the drug of abuse gamma hydroxybutyric acid (GHB) has caused various interpretative problems for toxicologists. In order to obtain data for the presence of endogenous GHB in humans and to investigate any factors that may affect this, a volunteer study was undertaken. The GHB concentrations in 119 urine specimens from GHB-free subjects and 25 urine specimens submitted for toxicological analysis showed maximal urinary GHB concentrations of 3mg/l. Analysis of 15 plasma specimens submitted for toxicological analysis detected no measurable GHB (less than 2.5mg/l). Studies in a male and female volunteer in which different dietary food groups were ingested at weekly intervals, showed significant creatinine-independent intra-individual fluctuation with overall urine GHB concentrations between 0 and 2.55, and 0 and 2.74mg/l, respectively. Urinary concentrations did not appear to be affected by the particular dietary groups studied.The concentrations measured by gas chromatography with flame ionisation detection (GC-FID) and gas chromatography with mass spectrometry (GC-MS) lend further support to the proposed urinary and plasma interpretative cut-offs of 10 and 4mg/l, respectively, where below this it is not possible to determine whether any GHB detected is endogenous or exogenous in nature.