The suitability of visual taphonomic methods for digital photographs: An experimental approach with pig carcasses in a tropical climate

In the context of increased scrutiny of the methods in forensic sciences, it is essential to ensure that the approaches used in forensic taphonomy to measure decomposition and estimate the postmortem interval are underpinned by robust evidence-based data. Digital photographs are an important source of documentation in forensic taphonomic investigations but the suitability of the current approaches for photographs, rather than real-time remains, is poorly studied which can undermine accurate forensic conclusions. The present study aimed to investigate the suitability of 2D colour digital photographs for evaluating decomposition of exposed human analogues (Sus scrofa domesticus) in a tropical savanna environment (Hawaii), using two published scoring methods; Megyesi et al., 2005 and Keough et al., 2017. It was found that there were significant differences between the real-time and photograph decomposition scores when the Megyesi et al. method was used. However, the Keough et al. method applied to photographs reflected real-time decomposition more closely and thus appears more suitable to evaluate pig decomposition from 2D photographs. The findings indicate that the type of scoring method used has a significant impact on the ability to accurately evaluate the decomposition of exposed pig carcasses from photographs. It was further identified that photographic taphonomic analysis can reach high inter-observer reproducibility. These novel findings are of significant importance for the forensic sciences as they highlight the potential for high quality photograph coverage to provide useful complementary information for the forensic taphonomic investigation. New recommendations to develop robust transparent approaches adapted to photographs in forensic taphonomy are suggested based on these findings.     

‘The Sky is Falling!’ – Responses to the ‘Going Dark’ problem

The shared concern expressed in the two quotes below is that modern technologies provide criminals with a capability to evade investigation. This comment piece examines some of the policy and legal options available to governments and law enforcement agencies to try to address this concern. While accepting the claim that this phenomenon represents a real challenge to law enforcement agencies, we currently have insufficient evidence to show the true extent of the problem. What this piece does not accept is the implication contained in the quotes, and often made explicit by others, that the use of encryption represents a fundamental and irreversible shift in the balance of power between criminals and their investigators from what previously prevailed. Such claims tend to lack historical perspective, which is one of the themes of this 200th issue of Computer Law and Security Review.     

Law enforcement access to personal data originally collected by private parties: Missing data subjects' safeguards in directive 2016/680?

Access by law enforcement authorities to personal data initially collected by private parties for commercial or operational purposes is very common, as shown by the transparency reports of new technology companies on law enforcement requests. From a data protection perspective, the scenario of law enforcement access is not necessarily well taken into account. The adoption of the new data protection framework offers the opportunity to assess whether the new ‘police’ Directive, which regulates the processing of personal data for law enforcement purposes, offers sufficient safeguards to individuals. To make this assessment, provisions contained in Directive 2016/680 are tested against the standards established by the ECJ in Digital Rights Ireland and Tele2 Sverige on the retention of data and their further access and use by police authorities. The analysis reveals that Directive 2016/680 does not contain the safeguards identified in the case law. The paper further assesses the role and efficiency of the principle of purpose limitation as a safeguard against repurposing in a law enforcement context. Last, solutions to overcome the shortcomings of Directive 2016/680 are examined in conclusion.     

A new method for the recovery and evidential comparison of footwear impressions using 3D structured light scanning

Footwear impressions are one of the most common forms of evidence to be found at a crime scene, and can potentially offer the investigator a wealth of intelligence. Our aim is to highlight a new and improved technique for the recovery of footwear impressions, using three-dimensional structured light scanning. Results from this preliminary study demonstrate that this new approach is non-destructive, safe to use and is fast, reliable and accurate. Further, since this is a digital method, there is also the option of digital comparison between items of footwear and footwear impressions, and an increased ability to share recovered footwear impressions between forensic staff thus speeding up the investigation.     

The detection of deception with the reality monitoring approach: a review of the empirical evidence

One of the verbal approaches to the detection of deceit is based on research on human memory that tries to identify the characteristics that differentiate between internal and external memories (reality monitoring). This approach has attempted to extrapolate the contributions of reality monitoring (RM) research to the deception area. In this paper, we have attempted to review all available studies conducted in several countries in order to yield some general conclusions concerning the discriminative power of this approach. Regarding individual criteria, the empirical results are not very encouraging: few criteria discriminate significantly across studies, and there are several variables that moderate their effect. Some of the contradictory findings may have emerged because of differences in the operationalizations and procedures used across individual studies. However, more promising results have been reported in recent studies, and the approach as a whole appears to discriminate above chance level, reaching accuracy rates that are similar to those of criteria-based content analysis (CBCA). Some suggestions for future research are made.     

Weighted Content Analysis of Political Advertisements

This article proposes weighted content analysis as a methodological extension of traditional (unweighted) content analysis of political advertising. Weighted content analysis distinguishes between political ads that were produced but not aired and ads that actually aired in a particular media market. To illustrate the advantages of weighted content analysis, this article examines the 1996 presidential campaign in Columbus, Ohio. The tone of 132 presidential campaign ads produced by both candidates is compared with the tone of the 2,522 ads that aired on the three major network affiliates in Columbus. The price of the ad buy is used as an alternative weight that takes into account audience size and thus allows a further distinction between aired and watched ads. Both weighting procedures show that Republican advertising in 1996 in Columbus was more negative than Democratic advertising during the fall campaign, a result that remains undetected by unweighted content analysis. The article concludes by describing three different ways to obtain weighting data: political files kept by television stations and cable providers, commercial tracking data, and internal campaign records.     

The interconnections of political power,psychotherapy, and world community

This study of the main evening television news programs in four European countries focuses on the framing of news surrounding a major European event, the January 1, 1999, introduction of the common European currency, the euro. We investigated the visibility of political and economic news in general and of the launch of the euro in particular. We found variations across countries in the emphasis on political and economic news, with the proportion of the newscast normally devoted to these subjects ranging from 45% to 60%. Journalists in all countries were more likely to emphasize conflict (rather than economic consequences) in framing general political and economic news. In the coverage of the launch of the euro, there was a greater emphasis on framing the news in terms of economic consequences. The findings are discussed in terms of influences on framing practices internal and external to journalism and the value of the cross-national comparative approach.     

Measuring error for adjacent policy position estimates: Dealing with uncertainty using CMP data

Careful users of CMP party position data should take the uncertainty of position estimates into account. We compare and evaluate two current approaches that provide error estimates for party positions. Researchers of the CMP group identify measurement error in quantitative content analysis as the cause of uncertainty about position estimates, whereas a second approach by Benoit et al. (2009) attributes the uncertainty of position estimates to a stochastic generation of election programs. We illustrate the commonalities and differences of these approaches and provide two empirical applications, the identification of the left–right order of parties and of policy shifts by parties, using CMP data for 25 countries. Despite conceptual differences, results in these applications are surprisingly similar.     

Digital identity,privacy and the right to identity in the United States of America

This article analyses digital identity as an emergent legal concept in the United States of America, as a consequence of the move to place all federal government services on-line. The features and functions of digital identity and its legal nature are examined, and the consequences are considered.     

公务员面试计算机评分系统中数据加密技术的研究与实现

随着我国公务员录用面试信息化建设工作的深入推进,各地陆续在公务员面试过程中采用了公务员面试计算机评分系统。该系统对考官基本信息库、考官的原始计分表、监督员（复核员）的统计表等数据的加密存贮和传输非常重要。为避免泄密,基于PKI技术的“混合签密”方案应用于面试计算机评分系统,能很好地提供机密性、完整性、可认证和不可否认性保证数据的安全性。