The Effect of Image Quality and Forensic Expertise in Facial Image Comparisons

Images of perpetrators in surveillance video footage are often used as evidence in court. In this study, identification accuracy was compared for forensic experts and untrained persons in facial image comparisons as well as the impact of image quality. Participants viewed thirty image pairs and were asked to rate the level of support garnered from their observations for concluding whether or not the two images showed the same person. Forensic experts reached their conclusions with significantly fewer errors than did untrained participants. They were also better than novices at determining when two high‐quality images depicted the same person. Notably, lower image quality led to more careful conclusions by experts, but not for untrained participants. In summary, the untrained participants had more false negatives and false positives than experts, which in the latter case could lead to a higher risk of an innocent person being convicted for an untrained witness.     

Determination of Herbicides Paraquat,Glyphosate, and Aminomethylphosphonic Acid in Marijuana Samples by Capillary Electrophoresis

In this work, two methods were developed to determine herbicides paraquat, glyphosate, and aminomethylphosphonic acid (AMPA) in marijuana samples by capillary electrophoresis. For paraquat analysis, sample was extracted with aqueous acetic acid solution and analyzed by capillary zone electrophoresis with direct UV detection. The running electrolyte was 50 mmol/L phosphate buffer (pH 2.50). For glyphosate and AMPA, indirect UV/VIS detection was used, as these substances do not present chromophoric groups. Samples were extracted with 5 mmol/L hydrochloric acid. The running electrolyte was 10 mmol/L gallic acid, 6 mmol/L TRIS, and 0.1 mmol/L CTAB (pH = 4.7). The methods presented good linearity, precision, accuracy, and recovery. Paraquat was detected in 12 samples (n = 130), ranging from 0.01 to 25.1 mg/g. Three samples were positive for glyphosate (0.15–0.75 mg/g), and one sample presented AMPA as well. Experimental studies are suggested to evaluate the risks of these concentrations to marijuana user.     

Angola and Kenya Pavilions in the 2013 Venice Biennale: African Contemporary Art and Cultural Diplomacy in the “Olympics of Art”

A record six African states were awarded a national pavilion at the 2013 Venice Biennale, the premier venue for showcasing a nation's contemporary art, from which Africa has historically been excluded. While first-time participant Angola won the top prize, Kenya's pavilion was the target of bafflement and ire. Using a cultural diplomacy framework that integrates the insights of leading scholars, this research makes concrete recommendations for practitioners vis-à-vis a comparative case study of the two pavilions. Analysis and recommendations consider the interests of a variety of stakeholders and offer insights relevant to Africa and other emerging regions.     

Passivity at Work. A Conversation on an Element in the Philosophy of Giorgio Agamben

This text is based on a staged dialogue conceived by Alice Lagaay and Juliane Schiffers, which closed the conference ‘How not to speak’ (Wie nicht sprechen) at the Centre Marc Bloch in Berlin on 22 April. Critical comments and questions emerging from the discussion that took place on that day are reflected in ‘Voice Off’.     

Use of Forensic DNA Evidence in Prosecutors''Offices

This article reports on a survey of DNA-related practices and procedures within District Attorneys' offices to obtain preliminary information about actual prosecutorial practices. The data obtained is preliminary but supportive of further study of areas targeted by the survey.