Prevention science,drug abuse prevention,and Life Skills Training: Comments on the state of the science

There has been tremendous growth in the field of prevention science over the past two decades. The defining features of contemporary prevention science are high quality empirical research using rigorous and well-established scientific methods, careful hyphothesis testing, and the systematic accumulation of knowledge. One area where substantial progress has been made is in our understanding of the etiology and prevention of tobacoo, alcohol, and illicit drug abuse. In this paper, we review the growth in prevention as a scientific enterprise, discuss advances in drug abuse prevention research, and review the effectiveness of one approach to the problem of adolescent drug abuse, the Life Skills Traning (LST) program, and the methodological strengths of the LST evaluation research. In addition, we provide a response to criticism regarding two types of data analysis in evaluation research, and show that these analyses can help address a number of important research questions with implications for theory and practice. First, the analysis of high fidelity subsamples can address research questions about the importance of program implementation fidelity; and second, composite measures of concurrent tobacco, alcohol, and marijuana use (i.e., polydrug use) are useful in testing research questions about program effects on more serious levels of drug involvement. With an increasing number of ramdomized controlled trials underway, the field of prevention science is contributing to a new generation of evidence-based approaches and policies that, if widely utilized, offer the potential of reducing the mortality and morbidity associated with a number of major health and social problems.     

Automated Texture Recognition of Quartz Sand Grains for Forensic Applications*

Quartz sand surface texture analysis has been automated for the first time for forensic application. The derived Basic Image Features (BIFs) provide computer-generated texture recognition from preexisting data sets. The technique was applied to two distinct classification problems; first, the ability of the system to discriminate between (quartz) sand grains with upturned plate features (indicative of eolian, global sand sea environments) and grains that do not exhibit these features. A success rate of grain classification of 98.8% was achieved. Second, to test the ability of the computer recognition system to identify specific energy levels of formation of the upturned plate surface texture features. Such recognition ability has to date been beyond manual geological interpretation. The discrimination performance was enhanced to an exact classification success rate of 81%. The enhanced potential for routine forensic investigation of the provenance of common quartz sand is indicated.     

A bad trip for health-related human rights: implications of Momcilovic v The Queen (2011) 85 ALJR 957

Momcilovic v The Queen (2011) 85 ALJR 957; [2011] HCA 34 arose from a prosecution for drug trafficking brought under the Drugs, Poisons and Controlled Substances Act 1981 (Vic). The Australian High Court held that the Charter of Human Rights and Responsibilities Act 2006 (Vic) (the Charter) validly conferred a power on the Victorian Supreme Court and Court of Appeal to interpret legislation in a manner consistent with a defined list of human rights. By a slim majority it also held that the Charter validly created a judicial power to "declare" a law inconsistent with one or more enumerated human rights. In reaching its decision, however, the majority supported a narrow interpretation likely to undermine the intended capacity of the Charter to act as a remedial mechanism to reform laws, regulations and administrative practices which infringe human rights and freedoms. Although Momcilovic involved interpretation of a specific State human rights law, the High Court judgments allude to significant problems should the Federal Government seek to introduce a similar charter-based human rights system. Momcilovic, therefore, represents a risk to future efforts to develop nationally consistent Australian human rights jurisprudence. This has particular relevance to health and medically related areas such as the freedom from torture and degrading and inhuman treatment and, in future, enforceable constitutional health-related human rights such as that to emergency health care.     

Yield and turnover of illicit indoor cannabis (Cannabis spp.) plantations in Belgium

In prosecution, Belgian judiciary currently uses outdated yield figures (28.1g per plant, sold at € 3/g at grower level) for fining illicit indoor cannabis plantations. Using state-of-the-art cultivation techniques, our growth experiments showed that yield is better expressed in g/m(2) cultivated surface area rather than in g per plant, and that yield varies significantly between different cannabis strains. It was found that the lower-bound of the one-sided 95% confidence interval of the yield of an indoor cannabis plantation can be set at 575 g/m(2). Prices and pricing mechanisms were investigated using interviews with respondents selected through snowball sampling. Results reveal that (i) the Belgian cannabis market chain is highly complex; (ii) unit prices are predominantly determined by transaction sizes; but also (iii) a set of product- and socially-related price-fixing mechanisms have an equally important role. At grower level, respondents reported prices for 1 g of dry cannabis buds to range € 3.00-4.25.